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CONSOLIDATED 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, 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        
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        
Balance, beginning at Dec. 31, 2018 $ 11,715 70,651,416 22,760,215   $ 93,423,346
Balance, beginning (in shares) at Dec. 31, 2018 11,718,246       11,718,246
Net income     1,658,598   $ 1,658,598
Stock based compensation expense $ 21 330,766     330,787
Stock based compensation expense (in shares) 17,619        
Costs related to stock offering   (64,371)     (64,371)
Common stock issued upon exercise of options (in shares) 521        
Balance, ending at Mar. 31, 2019 $ 11,736 $ 70,917,811 $ 24,418,813   $ 95,348,360
Balance, ending (in shares) at Mar. 31, 2019 11,736,386       11,736,386