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Consolidated Statements of Stockholders' Equity (USD $)
Common Stock [Member]
Employee Loans [Member]
Retained Earnings [Member]
Total
Balance as of at Mar. 31, 2011 $ 7,180,000 $ (437,000) $ 29,674,000 $ 36,417,000
Balance as of (in Shares) at Mar. 31, 2011 3,250,736      
Common stock issued for conversion of stock options net of shares returned as payment 1,277,000 41,000   1,318,000
Common stock issued for conversion of stock options net of share returned as payment (in Shares) 88,043     100,677
Purchase and retirement of common stock (60,000)   (537,000) (597,000)
Purchase and retirement of common stock (in Shares) (16,814)      
Dividends paid     (1,645,000) (1,645,000)
Stock-based compensation 441,000     441,000
Tax benefit on exercise of stock options 62,000     62,000
Net income     7,919,000 7,919,000
Balance as of at Mar. 31, 2012 8,900,000 (396,000) 35,411,000 43,915,000
Balance as of (in Shares) at Mar. 31, 2012 3,321,965      
Common stock issued for conversion of stock options net of shares returned as payment 1,101,000 (203,000)   898,000
Common stock issued for conversion of stock options net of share returned as payment (in Shares) 77,753     93,325
Purchase and retirement of common stock (56,000) 450,000 (496,000) (102,000)
Purchase and retirement of common stock (in Shares) (11,170)      
Dividends paid     (1,815,000) (1,815,000)
Stock-based compensation 1,112,000     1,112,000
Tax benefit on exercise of stock options 295,000     295,000
Net income     8,450,000 8,450,000
Balance as of at Mar. 31, 2013 11,352,000 (149,000) 41,550,000 52,753,000
Balance as of (in Shares) at Mar. 31, 2013 3,388,548     3,388,548
Common stock issued for conversion of stock options net of shares returned as payment 1,845,000     1,845,000
Common stock issued for conversion of stock options net of share returned as payment (in Shares) 104,864     117,885
Purchase and retirement of common stock (147,000) 125,000   (22,000)
Purchase and retirement of common stock (in Shares) (2,784)      
Dividends paid     (1,989,000) (1,989,000)
Stock-based compensation 840,000     840,000
Tax benefit on exercise of stock options 1,906,000     1,906,000
Net income     9,000,000 9,000,000
Balance as of at Mar. 31, 2014 $ 15,796,000 $ (24,000) $ 48,561,000 $ 64,333,000
Balance as of (in Shares) at Mar. 31, 2014 3,490,628     3,490,628