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STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (USD $)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balance at Dec. 31, 2012 $ 8,371 $ 49,780,673 $ 30,845,982 $ (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 1,671,276 0 1,671,276
Change in unrealized loss from interest rate swap 0 0 0 3,711 3,711
Common stock issued upon exercise of stock options 3 (3) 0 0 0
Common stock issued upon exercise of options (in shares) 2,645        
Tax provision (benefit) of stock option exercise 0 (26,000) 0 0 (26,000)
Common stock issued as bonus 18 152,056 0 0 152,074
Common stock issued as bonus (in shares) 17,870        
Stock compensation expense 0 360,964 0 0 360,964
Balance at Mar. 31, 2013 8,392 50,267,690 32,517,258 (37,116) 82,756,224
Balance (in shares) at Mar. 31, 2013 8,391,954        
Balance at Dec. 31, 2013 8,410 50,381,348 38,582,876 (21,115) 88,951,519
Balance (in shares) at Dec. 31, 2013 8,410,493        
Increase (Decrease) in Shareholders' Equity [Roll Forward]          
Net Income 0 0 1,728,869 0 1,728,869
Change in unrealized loss from interest rate swap 0 0 0 3,179 3,179
Common stock issued upon exercise of stock options 51 278,049 0 0 278,100
Common stock issued upon exercise of options (in shares) 50,292        
Tax provision (benefit) of stock option exercise 0 52,000 0 0 52,000
Common stock issued as bonus         0
Stock compensation expense 0 102,809 0 0 102,809
Balance at Mar. 31, 2014 $ 8,461 $ 50,814,206 $ 40,311,745 $ (17,936) $ 91,116,476
Balance (in shares) at Mar. 31, 2014 8,460,785