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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