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STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 6,123 | $ 27,369,043 | $ 11,888,028 | $ (692,806) | $ (52,874) | $ 38,517,514
Balance (in shares) at Dec. 31, 2009 | 6,122,524 |  |  |  |  |
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 0 | 0 | 529,896 | 0 | 0 | 529,896
Change in unrealized loss from interest rate swap | 0 | 0 | 0 | 0 | 7,470 | 7,470
Common stock issued in share offering | 500 | 3,529,041 | 0 | 0 | 0 | 3,529,541
Common stock issued in share offering (in shares) | 500,000 |  |  |  |  |
Common stock issued upon exercise of options | 272 | 1,389,678 | 0 | 0 | 0 | 1,389,950
Common stock issued upon exercise of options (in shares) | 272,000 |  |  |  |  | 272,000
Common stock issued as employee compensation | 17 | 126,846 | 0 | 0 | 0 | 126,863
Common stock issued as employee compensation (in shares) | 17,046 |  |  |  |  |
Stock based compensation expense | 0 | 5,536,293 | 0 | 0 | 0 | 553,629
Tax benefit from stock option plans | 0 | 304,000 | 0 | 0 | 0 | 304,000
Treasury stock (acquired) retired | 0 | 0 | 0 | (288,420) | 0 | (288,420)
Treasury stock (acquired) retired (in shares) | 0 |  |  |  |  |
Balance at Dec. 31, 2010 | 6,912 | 33,272,237 | 12,417,924 | (981,226) | (45,404) | 44,670,443
Balance (in shares) at Dec. 31, 2010 | 6,911,570 |  |  |  |  |
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 0 | 0 | 7,416,928 | 0 | 0 | 7,416,928
Change in unrealized loss from interest rate swap | 0 | 0 | 0 | 0 | 23,632 | 23,632
Common stock issued upon exercise of options | 165 | 614,282 | 0 | 0 | 0 | 614,447
Common stock issued upon exercise of options (in shares) | 165,333 |  |  |  |  | 165,333
Common stock issued as employee compensation | 3 | 36,154 | 0 | 0 | 0 | 36,157
Common stock issued as employee compensation (in shares) | 2,735 |  |  |  |  |
Stock based compensation expense | 0 | 985,600 | 0 | 0 | 0 | 985,600
Tax benefit from stock option plans | 0 | 438,000 | 0 | 0 | 0 | 438,000
Treasury stock (acquired) retired | 0 | 0 | 0 | (159,000) | 0 | (159,000)
Treasury stock (acquired) retired (in shares) | 0 |  |  |  |  |
Balance at Dec. 31, 2011 | 7,080 | 35,346,273 | 19,834,852 | (1,140,226) | (21,772) | 54,026,207
Balance (in shares) at Dec. 31, 2011 | 7,079,638 |  |  |  |  |
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 0 | 0 | 11,011,130 | 0 | 0 | 11,011,130
Change in unrealized loss from interest rate swap | 0 | 0 | 0 | 0 | (19,055) | (19,055)
Common stock issued in share offering | 1,195 | 13,322,499 | 0 | 0 | 0 | 13,323,694
Common stock issued in share offering (in shares) | 1,195,750 |  |  |  |  |
Common stock issued upon exercise of options | 210 | 1,290,305 | 0 | 0 | 0 | 1,290,515
Common stock issued upon exercise of options (in shares) | 210,143 |  |  |  |  | 240,000
Common stock issued as employee compensation | 19 | 266,032 | 0 | 0 | 0 | 266,051
Common stock issued as employee compensation (in shares) | 19,165 |  |  |  |  |
Stock based compensation expense | 0 | 382,657 | 0 | 0 | 0 | 382,657
Tax benefit from stock option plans | 0 | 313,000 | 0 | 0 | 0 | 313,000
Treasury stock (acquired) retired | (133) | (1,140,093) | 0 | 1,140,226 | 0 | 0
Treasury stock (acquired) retired (in shares) | (133,257) |  |  |  |  |
Balance at Dec. 31, 2012 | $ 8,371 | $ 49,780,673 | $ 30,845,982 | $ 0 | $ (40,827) | $ 80,594,199
Balance (in shares) at Dec. 31, 2012 | 8,371,439 |  |  |  |  |

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