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, 2018	17,129,680
Balance at Dec. 31, 2018	$ 185,561	$ 74,568,627	$ (1,813,546)	$ (6,270,675)	$ (57,036,241)	$ 9,633,726
Issuance of common stock under equity incentive plan (in shares)	62,222
Issuance of common stock under equity incentive plan	$ 62	58,551				58,613
Warrant compensation costs		8,985				8,985
Deferred compensation amortization				224,795		224,795
Purchase of treasury stock			(21,822)			(21,822)
Net (loss) for the period					(1,072,889)	(1,072,889)
Issuance of common stock, public offering (in shares)	769,230
Issuance of common stock, public offering	$ 769	1,793,136				1,793,905
Balance (in shares) at Mar. 31, 2019	17,961,132
Balance at Mar. 31, 2019	$ 186,392	76,429,299	(1,835,368)	(6,045,880)	(58,109,130)	10,625,313
Balance (in shares) at Dec. 31, 2018	17,129,680
Balance at Dec. 31, 2018	$ 185,561	74,568,627	(1,813,546)	(6,270,675)	(57,036,241)	9,633,726
Net (loss) for the period						(2,348,500)
Balance (in shares) at Jun. 30, 2019	18,008,577
Balance at Jun. 30, 2019	$ 186,439	76,558,492	(1,864,061)	(5,810,035)	(59,384,741)	9,686,094
Balance (in shares) at Mar. 31, 2019	17,961,132
Balance at Mar. 31, 2019	$ 186,392	76,429,299	(1,835,368)	(6,045,880)	(58,109,130)	10,625,313
Issuance of common stock under equity incentive plan (in shares)	53,445
Issuance of common stock under equity incentive plan	$ 53	133,462				133,515
Warrant compensation costs		8,985				8,985
Deferred compensation amortization				222,585		222,585
Purchase of treasury stock			(28,693)			(28,693)
Net (loss) for the period					(1,275,611)	(1,275,611)
Reversal of deferred stock compensation that did not vest (in shares)	(6,000)
Reversal of deferred stock compensation that did not vest	$ (6)	(13,254)		13,260
Balance (in shares) at Jun. 30, 2019	18,008,577
Balance at Jun. 30, 2019	$ 186,439	76,558,492	(1,864,061)	(5,810,035)	(59,384,741)	9,686,094
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			(26,629)			(26,629)
Net (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 (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		(1,559,520)		83,284
Warrant compensation costs		8,988				8,988
Deferred compensation amortization				267,207		267,207
Purchase of treasury stock			(55,819)			(55,819)
Net (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