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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, 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     2,938,865     2,938,865
Change in unrealized loss from interest rate swap         11,268 11,268
Common stock issued upon exercise of options 137         410,950
Common stock issued upon exercise of options (in shares) 137,000          
Common stock issued as bonus           0
Stock compensation expense   942,226       942,226
Tax benefit from stock option plans   438,000       438,000
Treasury stock acquired       (159,000)   (159,000)
Balance at Jun. 30, 2011 7,049 35,063,276 15,356,789 (1,140,226) (34,136) 49,252,752
Balance (in shares) at Jun. 30, 2011 7,048,570          
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     4,615,338     4,615,338
Change in unrealized loss from interest rate swap         (32,336) (32,336)
Common stock issued upon exercise of options 196 1,224,319       1,224,515
Common stock issued upon exercise of options (in shares) 196,078         (205,000)
Common stock issued in share offering 1,000 11,106,580       11,107,580
Common stock issued in share offering (in shares) 1,000,000         1,000,000
Common stock issued as bonus 15 228,275       228,290
Common stock issued as bonus (in shares) 15,260          
Stock compensation expense   382,657 0     382,657
Tax benefit from stock option plans           0
Treasury stock retired (133) (1,140,093)   1,140,226   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