Annual report pursuant to Section 13 and 15(d)

Capital Stock and Stock Restrictions (Details Textual)

v3.20.1
Capital Stock and Stock Restrictions (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
May 18, 2020
Mar. 31, 2018
May 17, 2017
Class of Stock [Line Items]            
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 0.7        
Preferred Stock [Member]            
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized   1,000,000 1,000,000      
Class A Common Stock [Member]            
Class of Stock [Line Items]            
Treasury Stock, Shares, Acquired   92,000 489,000      
Common Stock, Shares, Outstanding   12,224,450 11,909,979   12,146,000  
Class B Common Stock [Member]            
Class of Stock [Line Items]            
Common Stock, Shares, Outstanding   3,484,287 3,484,287   3,484,000  
2017 authorization [Member] | Class A Common Stock [Member]            
Class of Stock [Line Items]            
Stock Repurchase Program, Remaining Authorized Repurchase Amount           $ 2.0
Treasury Stock, Shares, Acquired   0 426,283      
Treasury Stock Acquired, Average Cost Per Share     $ 2.43      
August Two Thousand Eleven Authorization [Member] | Class A Common Stock [Member]            
Class of Stock [Line Items]            
Stock Repurchase Program Remaining Authorized Repurchases Amount           $ 0.1
Outside of Publically Announced Repurchase Program [Member] | Class A Common Stock [Member]            
Class of Stock [Line Items]            
Treasury Stock Acquired, Average Cost Per Share   $ 2.06 $ 3.18      
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation   93,039 62,260      
Voting trust and other trusts [Member] | Class B Common Stock [Member]            
Class of Stock [Line Items]            
Common Stock, Shares, Outstanding   3,484,287        
Subsequent Event [Member] | Voting Trust [Member]            
Class of Stock [Line Items]            
Voting Control       49.30%    
Subsequent Event [Member] | Voting trust and other trusts [Member]            
Class of Stock [Line Items]            
Voting Control       53.50%    
Restricted Stock Units (RSUs) [Member]            
Class of Stock [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   301,037 412,500      
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member]            
Class of Stock [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 300,000          
Performance Shares [Member]            
Class of Stock [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   216,144 50,000      
Performance Shares [Member] | Subsequent Event [Member]            
Class of Stock [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 200,000