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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2015 6,198,135      
Balance at Dec. 31, 2015 $ 61,981 $ 22,895,202 $ 10,267,446 $ 33,224,629
Exercise of stock options (in shares) 100,000     100,000
Exercise of stock options $ 1,000 461,000 $ 462,000
Stock-based compensation (in shares) 48,455      
Stock-based compensation $ 485 775,272 775,757
Net income/(loss) (149,124) $ (149,124)
Balance (in shares) at Dec. 31, 2016 6,346,590     6,346,590
Balance at Dec. 31, 2016 $ 63,466 24,131,474 10,118,322 $ 34,313,262
Exercise of stock options (in shares) 36,800     34,000
Exercise of stock options $ 368 145,852 $ 146,220
Stock-based compensation (in shares) 75,324      
Stock-based compensation $ 753 931,990 932,743
Net income/(loss) 5,261,411 $ 5,261,411
Balance (in shares) at Dec. 31, 2017 6,458,714     6,458,714
Balance at Dec. 31, 2017 $ 64,587 $ 25,209,316 $ 15,379,733 $ 40,653,636