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CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (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, 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 4,615,338 0 0 4,615,338
Change in unrealized loss from interest rate swap 0 0 0 0 (32,336) (32,336)
Common stock issued in share offering 1,000 11,106,580 0 0 0 11,107,580
Common stock issued in share offering (in shares) 1,000,000          
Common stock issued upon exercise of options 196 1,224,319 0 0 0 1,224,515
Common stock issued upon exercise of options (in shares) 196,078          
Tax benefit from stock options           0
Common stock issued as bonus 15 228,275 0 0 0 228,290
Common stock issued as bonus (in shares) 15,260          
Stock compensation expense 0 382,657 0 0 0 382,657
Treasury stock retired (133) (1,140,093) 0 1,140,226 0 0
Treasury stock retired (in shares) (133,257)          
Balance at Jun. 30, 2012 8,158 47,148,011 24,450,190 0 (54,108) 71,552,251
Balance (in shares) at Jun. 30, 2012 8,157,719          
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          
Increase (Decrease) in Shareholders' Equity [Roll Forward]            
Net Income 0 0 3,455,551 0 0 3,455,551
Change in unrealized loss from interest rate swap 0 0 0 0 17,390 17,390
Common stock issued upon exercise of options 3 (3) 0 0 0 0
Common stock issued upon exercise of options (in shares) 2,645         20,000
Tax benefit from stock options 0 (26,000) 0 0 0 (26,000)
Common stock issued as bonus 18 152,056 0 0 0 152,074
Common stock issued as bonus (in shares) 17,870          
Stock compensation expense 0 360,964 0 0 0 360,964
Balance at Jun. 30, 2013 $ 8,392 $ 50,267,690 $ 34,301,533 $ 0 $ (23,437) $ 84,554,178
Balance (in shares) at Jun. 30, 2013 8,391,954