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CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balance, beginning at Dec. 31, 2016 $ 8,738 $ 52,824,950 $ 14,781,018 $ (9,000) $ 67,605,706
Balance, beginning (in shares) at Dec. 31, 2016 8,739,836        
Net income     1,249,301   1,249,301
Change in unrealized loss from interest rate swap       5,200 5,200
Stock-based compensation expense $ 79 422,914     422,993
Stock-based compensation expense (in shares) 77,284        
Balance, ending at Mar. 31, 2017 $ 8,817 53,247,864 16,030,319 (3,800) 69,283,200
Balance, ending (in shares) at Mar. 31, 2017 8,817,120        
Balance, beginning at Dec. 31, 2017 $ 8,863 53,770,618 20,548,652 (14,800) $ 74,313,333
Balance, beginning (in shares) at Dec. 31, 2017 8,864,319       8,864,319
Net income     1,256,765   $ 1,256,765
Change in unrealized loss from interest rate swap       (5,800) (5,800)
Common stock issued as employee compensation $ 5 45,908     45,913
Common stock issued as employee compensation (in shares) 5,130        
Stock-based compensation expense $ 51 303,889     303,940
Stock-based compensation expense (in shares) 54,396        
Balance, ending at Mar. 31, 2018 $ 8,919 $ 54,120,415 $ 21,805,417 $ (20,600) $ 75,914,151
Balance, ending (in shares) at Mar. 31, 2018 8,923,845       8,923,845