Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details Textual)

v3.3.0.814
Stock-Based Compensation (Details Textual) - USD ($)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,181,863    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from stock options exercised $ 257,000 $ 1,677,000 $ 87,000
2004 Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 2,605,000 1,871,000 1,407,000
2004 Stock Incentive Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting schedule of equal annual installments over four years 4 years    
Stock Option Contractual Life from Grant Date 7 years    
Allocated Share-based Compensation Expense $ 200,000 200,000 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 400,000 1,300,000 200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 300,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 11 months 9 days    
2004 Stock Incentive Plan [Member] | Stock Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Option Contractual Life from Grant Date 5 years    
2004 Stock Incentive Plan [Member] | Stock Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Option Contractual Life from Grant Date 10 years    
2004 Stock Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting schedule of equal annual installments over four years 4 years    
Allocated Share-based Compensation Expense $ 500,000 $ 500,000 $ 600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 100,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 3 months 7 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 100,000 90,000 70,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,200,000 $ 700,000 $ 800,000
2004 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting schedule of equal annual installments over four years 4 years    
Allocated Share-based Compensation Expense $ 1,700,000 $ 900,000 $ 600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 3,000,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 10 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 780,500 1,182,000 530,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,500,000 $ 500,000 $ 300,000
2004 Stock Incentive Plan [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 100,000 $ 300,000 $ 0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 100,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 5 months 19 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 217,500 285,000  
PSUs earned   94.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 300,000    
2004 Stock Incentive Plan [Member] | Performance Shares [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Potential PSU attainment range 0.00%    
2004 Stock Incentive Plan [Member] | Performance Shares [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Potential PSU attainment range 200.00%