Consolidated Statement of Changes in Stockholders' Equity - USD ($)	Private Placement [Member] Common Stock [Member]	Private Placement [Member] Additional Paid-in Capital [Member]	Private Placement [Member] Treasury Stock [Member]	Private Placement [Member] Deferred Compensation, Share-based Payments [Member]	Private Placement [Member] Retained Earnings [Member]	Private Placement [Member]	Public Stock Offering [Member] Common Stock [Member]	Public Stock Offering [Member] Additional Paid-in Capital [Member]	Public Stock Offering [Member] Treasury Stock [Member]	Public Stock Offering [Member] Deferred Compensation, Share-based Payments [Member]	Public Stock Offering [Member] Retained Earnings [Member]	Public Stock Offering [Member]	Public Stock Offering Two [Member] Common Stock [Member]	Public Stock Offering Two [Member] Additional Paid-in Capital [Member]	Public Stock Offering Two [Member] Treasury Stock [Member]	Public Stock Offering Two [Member] Deferred Compensation, Share-based Payments [Member]	Public Stock Offering Two [Member] Retained Earnings [Member]	Public Stock Offering Two [Member]	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, public offering (in shares)	769,230
Issuance of common stock, public offering	$ 769	$ 1,793,136				$ 1,793,905
Issuance of common stock, employees, restricted (in shares)																			175,000
Issuance of common stock, employees, restricted																			$ 175	272,825		(273,000)
Issuance of common stock under equity incentive plan (in shares)																			156,667
Issuance of common stock under equity incentive plan																			$ 157	397,999				398,156
Reversal of deferred compensation amortization that did not vest (in shares)																			(6,000)
Reversal of deferred compensation amortization that did not vest																			$ (6)	(13,254)		13,260
Warrant compensation cost																				35,940				35,940
Deferred compensation amortization																						894,261		894,261
Purchase of treasury stock																					(71,906)			(71,906)
Net (loss) for the year																							(5,115,747)	(5,115,747)
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, public offering (in shares)	1,796,407						1,956,858						4,705,883
Issuance of common stock, public offering	$ 1,796	$ 2,998,204				$ 3,000,000	$ 1,958	$ 2,556,087		$ (1,937,620)		$ 620,425	$ 4,705	$ 7,253,222				$ 7,257,927
Reversal of deferred compensation amortization that did not vest (in shares)																			(450,000)
Reversal of deferred compensation amortization that did not vest																			$ (450)	(791,550)		594,900		(197,100)
Warrant compensation cost																				588,224				588,224
Deferred compensation amortization																						1,052,002		1,052,002
Purchase of treasury stock																					(280,269)			(280,269)
Net (loss) for the year																							(2,906,183)	(2,906,183)
Cashless warrant exercise (in shares)																			27,051
Cashless warrant exercise																			$ 27	(27)
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