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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Treasury Stock
Retained Earnings
Total
Balance at Mar. 31, 2015 $ 32,655 $ (70,409) $ 127,642 $ 89,888
Balance (in shares) at Mar. 31, 2015 7,702      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss)     12,379 12,379
Issuance of common stock under stock options $ 85     85
Issuance of common stock under stock options (in shares) 13      
Grants of restricted share awards, net of forfeitures (in shares) 38      
Excess tax benefit on share awards $ (38)     (38)
Share-based compensation 11     11
Common shares purchased 574     574
Additional tender offer cost   (50)   (50)
Balance at Mar. 31, 2016 $ 33,287 (70,459) 140,021 102,849
Balance (in shares) at Mar. 31, 2016 7,753      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss)     5,409 5,409
Issuance of common stock under stock options $ 50     50
Issuance of common stock under stock options (in shares) 9      
Grants of restricted share awards, net of forfeitures (in shares) 48      
Tax deficiency on share awards $ (66)     (66)
Excess tax benefit on share awards 11     11
Share-based compensation 607     607
Balance at Mar. 31, 2017 $ 33,889 (70,459) 145,430 108,860
Balance (in shares) at Mar. 31, 2017 7,810      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss)     (1,098) (1,098)
Issuance of common stock under stock options $ 458     458
Issuance of common stock under stock options (in shares) 91      
Forfeitures of restricted share awards (in shares) (6)      
Share-based compensation $ 217     217
Balance at Mar. 31, 2018 $ 34,564 $ (70,459) $ 144,332 $ 108,437
Balance (in shares) at Mar. 31, 2018 7,895