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Shareholders Equity - USD ($)
Common Stock
Additional Paid-In Capital
Retained Earnings / Accumulated Deficit
Total
Beginning Balance at Dec. 31, 2017 $ 7,011 $ 64,777,620 $ (47,554,208)  
Beginning Balance (in shares) at Dec. 31, 2017 7,011,128      
Exercise of stock options $ 122 279,055   $ 279,177
Exercise of stock options (in shares) 121,981     121,981
Stock-based compensation   487,806   $ 487,806
Cost of tender offer $ (1,250) (5,020,580)   (5,021,830)
Cost of tender offer (in shares) (1,250,000)      
Net income (loss)     (571,141) (571,141)
Ending Balance at Dec. 31, 2018 $ 5,883 60,523,901 (48,125,349) 12,404,435
Ending Balance (in shares) at Dec. 31, 2018 5,883,109      
Exercise of stock options $ 25 23,289   $ 23,314
Exercise of stock options (in shares) 24,494     24,494
Stock-based compensation   $ 519,891   $ 519,891
Restricted stock grants 110 (110)   127,871
Restricted stock grants (in shares) $ 110,071     $ 110,071
Net income (loss)   $ 286,586   286,586
Ending Balance at Dec. 31, 2019 $ 6,018 $ 61,066,971 $ (47,838,763) $ 13,234,226
Ending Balance (in shares) at Dec. 31, 2019 6,017,674