Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (unaudited) (Details)

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Quarterly Results of Operations (unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Valuation Allowances and Reserves, Charged to Cost and Expense       $ 545,000              
Loss Contingency, Loss in Period   900,000                  
Income Tax Discrete Item   300,000               600,000  
Restructuring Charges                 149,000 550,000 0
Additional Contingency Expense     534,000                
Sales Revenue, Goods, Net 10,664,000 8,928,000 9,922,000 10,530,000 11,334,000 14,392,000 20,728,000 23,201,000 40,044,000 69,655,000 147,849,000
Gross profit 3,937,000 3,143,000 3,448,000 3,796,000 4,407,000 4,263,000 6,221,000 8,366,000 14,324,000 23,257,000 41,552,000
Goodwill impairment   0 0 0         2,884,000    
Total operating expenses 9,397,000 5,921,000 6,689,000 6,593,000 5,650,000 5,052,000 5,621,000 6,613,000 28,600,000 22,936,000 31,755,000
Gain on CNS asset sale         0 0 46,000 31,608,000   31,654,000  
Income (loss) before income taxes and discontinued operations (5,419,000) (2,735,000) (3,234,000) (2,713,000) (1,113,000) (720,000) 760,000 33,379,000 (14,101,000) 32,306,000 9,817,000
Income tax benefit (expense) (32,823,000) 1,399,000 1,059,000 973,000 (1,725,000) 268,000 1,810,000 (13,228,000) (29,392,000) (12,875,000) 53,304,000
Net income (loss) from continuing operations (38,242,000) (1,336,000) (2,175,000) (1,740,000) (2,838,000) (452,000) 2,570,000 20,151,000 (43,493,000) 19,431,000 63,121,000
Income (loss) from discontinued operations, net of tax benefit (expense) of $813, $(1,447) and $(53) for fiscal years 2013, 2012 and 2011, respectively 84,000 (629,000) 0 0 390,000 20,254,000 927,000 980,000 (545,000) 2,062,000 4,815,000
Net income (loss) (38,158,000) (1,965,000) (2,175,000) (1,740,000) (2,448,000) 19,802,000 3,497,000 21,131,000 (44,038,000) 41,982,000 67,936,000
Earnings Per Share, Basic $ (0.66) $ (0.03) $ (0.04) $ (0.03) $ 0 $ 0 $ 0 $ 0 $ (0.73) [1] $ 0.63 $ 1.00
Earnings Per Share, Diluted $ (0.66) $ (0.03) $ (0.04) $ (0.03) $ 0 $ 0 $ 0 $ 0 $ (0.73) [1] $ 0.62 $ 0.98
Noran Tel Restructuring [Member]
                      
Restructuring Charges         $ 300,000       $ 149,000 $ 275,000  
[1] *Per share amounts may not sum to totals because of rounding.