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Stockholders' Equity (Unaudited) - USD ($)
Common Stock
Additional Paid-In Capital
Retained Earnings / Accumulated Deficit
Total
Beginning Balance at Dec. 31, 2018 $ 5,883 $ 60,523,901 $ (48,125,349) $ 12,404,435
Beginning Balance (in shares) at Dec. 31, 2018 5,883,109      
Restricted stock grants 116 (116)    
Restricted stock grants (in shares) $ 116,050     116,050
Net gain (loss)     11,839 11,839
Ending Balance at Mar. 31, 2019 $ 5,999 $ 60,645,750 (48,113,510) 12,538,239
Ending Balance (in shares) at Mar. 31, 2019 5,999,159      
Beginning Balance at Dec. 31, 2018 $ 5,883 60,523,901 (48,125,349) $ 12,404,435
Beginning Balance (in shares) at Dec. 31, 2018 5,883,109      
Restricted stock grants       124,285
Net gain (loss)       $ 225,927
Ending Balance at Sep. 30, 2019 $ 6,000 60,916,306 (47,899,422) 13,022,884
Ending Balance (in shares) at Sep. 30, 2019 5,999,653      
Beginning Balance at Mar. 31, 2019 $ 5,999 60,645,750 (48,113,510) 12,538,239
Beginning Balance (in shares) at Mar. 31, 2019 5,999,159      
Net gain (loss)     119,790 119,790
Ending Balance at Jun. 30, 2019 $ 5,999 60,782,785 (47,993,720) 12,795,064
Ending Balance (in shares) at Jun. 30, 2019 5,999,159      
Stock options exercised $ 1 513   514
Stock options exercised (in shares) 494      
Stock-based compensation   133,008   133,008
Net gain (loss)     94,298 94,298
Ending Balance at Sep. 30, 2019 $ 6,000 60,916,306 (47,899,422) 13,022,884
Ending Balance (in shares) at Sep. 30, 2019 5,999,653      
Beginning Balance at Dec. 31, 2019 $ 6,018 61,066,971 (47,838,763) 13,234,226
Beginning Balance (in shares) at Dec. 31, 2019 6,017,674      
Repurchase of common stock $ (5) (8,491)   8,496
Repurchase of common stock (in shares) (4,967)      
Cancellation of restricted stocks $ (3) 3    
Cancellation of restricted stocks (in shares) (3,200)      
Net gain (loss)     (90,327) (90,327)
Ending Balance at Mar. 31, 2020 $ 6,010 61,190,548 (47,929,090) 13,267,468
Ending Balance (in shares) at Mar. 31, 2020 6,009,507      
Beginning Balance at Dec. 31, 2019 $ 6,018 61,066,971 (47,838,763) $ 13,234,226
Beginning Balance (in shares) at Dec. 31, 2019 6,017,674      
Restricted stock grants       389,680
Stock-based compensation       $ 392,985
Net gain (loss)       (4,861,136)
Ending Balance at Sep. 30, 2020 $ 6,051 61,525,589 (52,699,899) 8,831,741
Ending Balance (in shares) at Sep. 30, 2020 6,050,655      
Beginning Balance at Mar. 31, 2020 $ 6,010 61,190,548 (47,929,090) 13,267,468
Beginning Balance (in shares) at Mar. 31, 2020 6,009,507      
Cancellation of restricted stocks $ (1) 472   471
Cancellation of restricted stocks (in shares) (398)      
Stock-based compensation   131,369   131,369
Net gain (loss)     (768,023) (768,023)
Ending Balance at Jun. 30, 2020 $ 6,009 61,322,389 (48,697,113) 12,631,285
Ending Balance (in shares) at Jun. 30, 2020 6,009,109      
Stock options exercised $ 42 73,649   73,691
Stock options exercised (in shares) 41,546      
Stock-based compensation   129,551   129,551
Net gain (loss)     (4,002,786) (4,002,786)
Ending Balance at Sep. 30, 2020 $ 6,051 $ 61,525,589 $ (52,699,899) $ 8,831,741
Ending Balance (in shares) at Sep. 30, 2020 6,050,655