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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings, Appropriated [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2016 $ 27,309 $ 36,885,462 $ 6,241 $ 26,346,431 $ 63,265,443
Balance (in Shares) at Dec. 31, 2016 27,309,695        
Exercise of options - employees $ 3 (3)      
Exercise of options - employees (in Shares) 2,898        
Stock issued to employees $ 458 527,017     527,475
Stock issued to employees (in Shares) 457,500        
Stock issued for service $ 365 670,736     671,101
Stock issued for service (in Shares) 364,569        
Stock compensation for board of directors $ 57 115,120     115,177
Stock compensation for board of directors (in Shares) 57,265        
Stock options vested to board of directors and employees   484,045     484,045
Adoption ASU 2016-09 related to stock based compensation       (380,248) (380,248)
Net income       3,764,611 3,764,611
Balance at Dec. 31, 2017 $ 28,192 38,682,377 6,241 29,730,794 $ 68,447,604
Balance (in Shares) at Dec. 31, 2017 28,191,927       28,191,927
Exercise of options - employees $ 33 31,468     $ 31,501
Exercise of options - employees (in Shares) 32,730       40,000
Stock issued to employees $ 38 73,838     $ 73,876
Stock issued to employees (in Shares) 37,500        
Stock issued for service $ 304 486,295     486,599
Stock issued for service (in Shares) 304,495        
Stock options vested to board of directors and employees   567,171     567,171
Net income       5,299,625 5,299,625
Balance at Dec. 31, 2018 $ 28,567 $ 39,841,149 $ 6,241 $ 35,030,419 $ 74,906,376
Balance (in Shares) at Dec. 31, 2018 28,566,652       28,566,652