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Consolidated Statements of Shareholders' Equity (USD $) | Common Stock | Accumulated Other Comprehensive Loss | Retained Earnings | Total
--- | --- | --- | --- | ---
Balance at Mar. 31, 2010 | $ 25,544,820 | $ (178,090) | $ 71,440,086 | $ 96,806,816
Balance (in shares) at Mar. 31, 2010 | 11,718,870 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  | 16,768,294 | 16,768,294
Other comprehensive income, net of tax as applicable |  | 178,090 |  | 178,090
Issuance of common stock under stock options | 55,610 |  |  | 55,610
Issuance of common stock under stock options (in shares) | 26,090 |  |  |
Grants of restricted share awards, net of forfeitures (in shares) | 54,000 |  |  |
Vested performance share awards (in shares) | 7,700 |  |  |
Excess tax benefit on share awards, net | 76,973 |  |  | 76,973
Share-based compensation | 660,328 |  |  | 660,328
Balance at Mar. 31, 2011 | 26,337,731 |  | 88,208,380 | 114,546,111
Balance (in shares) at Mar. 31, 2011 | 11,806,660 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  | 22,221,759 | 22,221,759
Issuance of common stock under stock options | 830,277 |  |  | 830,277
Issuance of common stock under stock options (in shares) | 174,715 |  |  |
Grants of restricted share awards, net of forfeitures (in shares) | (29,400) |  |  |
Vested performance share awards (in shares) | 9,000 |  |  |
Excess tax benefit on share awards, net | 706,123 |  |  | 706,123
Share-based compensation | 551,912 |  |  | 551,912
Cash dividend |  |  | (3,593,021) | (3,593,021)
Balance at Mar. 31, 2012 | 28,426,043 |  | 106,837,118 | 135,263,161
Balance (in shares) at Mar. 31, 2012 | 11,960,975 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  |  | 19,940,946 | 19,940,946
Issuance of common stock under stock options | 612,465 |  |  | 612,465
Issuance of common stock under stock options (in shares) | 97,594 |  |  |
Grants of restricted share awards, net of forfeitures (in shares) | 85,000 |  |  |
Vested performance share awards (in shares) | 10,500 |  |  |
Excess tax benefit on share awards, net | 181,036 |  |  | 181,036
Share-based compensation | 812,004 |  |  | 812,004
Cash dividend |  |  | (29,844,516) | (29,844,516)
Balance at Mar. 31, 2013 | $ 30,031,548 |  | $ 96,933,548 | $ 126,965,096
Balance (in shares) at Mar. 31, 2013 | 12,154,069 |  |  |

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