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Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Deferred Compensation, Share-based Payments [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2019 18,224,577          
Balance at Dec. 31, 2019 $ 186,656 $ 77,055,273 $ (1,885,452) $ (5,636,154) $ (62,151,988) $ 7,568,335
Issuance of common stock under equity incentive plan (in shares) 51,000          
Issuance of common stock under equity incentive plan $ 51 59,440       59,491
Warrant compensation costs   8,985       8,985
Deferred compensation amortization       228,219   228,219
Purchase of treasury stock costs     (26,629)     (26,629)
Net income (loss) for the period         (835,009) (835,009)
Balance (in shares) at Mar. 31, 2020 18,275,577          
Balance at Mar. 31, 2020 $ 186,707 77,123,698 (1,912,081) (5,407,935) (62,986,997) 7,003,392
Balance (in shares) at Dec. 31, 2019 18,224,577          
Balance at Dec. 31, 2019 $ 186,656 77,055,273 (1,885,452) (5,636,154) (62,151,988) 7,568,335
Net income (loss) for the period           (2,123,178)
Balance (in shares) at Jun. 30, 2020 19,776,121          
Balance at Jun. 30, 2020 $ 188,207 78,773,990 (1,967,900) (6,700,248) (64,275,166) 6,018,883
Balance (in shares) at Mar. 31, 2020 18,275,577          
Balance at Mar. 31, 2020 $ 186,707 77,123,698 (1,912,081) (5,407,935) (62,986,997) 7,003,392
Issuance of common stock under equity incentive plan (in shares) 1,500,544          
Issuance of common stock under equity incentive plan $ 1,500 1,641,304       83,284
Warrant compensation costs   8,988       8,988
Deferred compensation amortization       267,207   267,207
Purchase of treasury stock costs     (55,819)     (55,819)
Net income (loss) for the period         (1,288,169) (1,288,169)
Balance (in shares) at Jun. 30, 2020 19,776,121          
Balance at Jun. 30, 2020 $ 188,207 78,773,990 (1,967,900) (6,700,248) (64,275,166) 6,018,883
Balance (in shares) at Dec. 31, 2020 26,260,776          
Balance at Dec. 31, 2020 $ 194,692 89,659,433 (2,165,721) (5,926,872) (65,058,171) 16,703,361
Issuance of common stock under equity incentive plan (in shares) 51,000          
Issuance of common stock under equity incentive plan $ 51 120,484       120,535
Warrant compensation costs   8,985       8,985
Cashless warrant exercise (in shares) 19,795          
Cashless warrant exercise $ 19 (19)        
Reversal of deferred compensation amortization that did not vest (in shares) (17,111)          
Reversal of deferred compensation amortization that did not vest $ (17) (48,599)   5,994   (42,622)
Deferred compensation amortization       249,801   249,801
Purchase of treasury stock costs     (49,454)     (49,454)
Net income (loss) for the period         (720,252) (720,252)
Balance (in shares) at Mar. 31, 2021 26,314,460          
Balance at Mar. 31, 2021 $ 194,745 89,740,284 (2,215,175) (5,671,077) (65,778,423) 16,270,354
Balance (in shares) at Dec. 31, 2020 26,260,776          
Balance at Dec. 31, 2020 $ 194,692 89,659,433 (2,165,721) (5,926,872) (65,058,171) 16,703,361
Net income (loss) for the period           (501,769)
Balance (in shares) at Jun. 30, 2021 26,261,016          
Balance at Jun. 30, 2021 $ 194,691 89,662,665 (2,244,985) (5,267,134) (65,559,940) 16,785,297
Balance (in shares) at Mar. 31, 2021 26,314,460          
Balance at Mar. 31, 2021 $ 194,745 89,740,284 (2,215,175) (5,671,077) (65,778,423) 16,270,354
Issuance of common stock under equity incentive plan (in shares) 61,556          
Issuance of common stock under equity incentive plan $ 61 150,481       150,542
Warrant compensation costs   8,985       8,985
Reversal of deferred compensation amortization that did not vest (in shares) (115,000)          
Reversal of deferred compensation amortization that did not vest $ (115) (237,085)   158,096   (79,104)
Deferred compensation amortization       245,847   245,847
Purchase of treasury stock costs     (29,810)     (29,810)
Net income (loss) for the period $ 0 0 0 0 218,483 218,483
Balance (in shares) at Jun. 30, 2021 26,261,016          
Balance at Jun. 30, 2021 $ 194,691 $ 89,662,665 $ (2,244,985) $ (5,267,134) $ (65,559,940) $ 16,785,297