Consolidated Statement of Changes in Stockholders' Equity - USD ($)	Total	Common Stock	Additional Paid - In Capital	Treasury Stock	Deferred Compensation	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018		17,129,680
Beginning balance at Dec. 31, 2018	$ 9,633,726	$ 185,561	$ 74,568,627	$ (1,813,546)	$ (6,270,675)	$ (57,036,241)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, public offering (shares)		769,230
Issuance of common stock, public offering	1,793,905	$ 769	1,793,136
Issuance of common stock under equity incentive plan (in shares)		62,222
Issuance of common stock under equity incentive plan	58,613	$ 62	58,551
Warrant compensation costs	8,985		8,985
Deferred compensation amortization	224,795				224,795
Purchase of treasury stock	(21,822)			(21,822)
Net (loss)	(1,072,889)					(1,072,889)
Ending balance (in shares) at Mar. 31, 2019		17,961,132
Ending balance at Mar. 31, 2019	10,625,313	$ 186,392	76,429,299	(1,835,368)	(6,045,880)	(58,109,130)
Beginning balance (in shares) at Dec. 31, 2019		18,224,577
Beginning balance at Dec. 31, 2019	7,568,335	$ 186,656	77,055,273	(1,885,452)	(5,636,154)	(62,151,988)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity incentive plan (in shares)		51,000
Issuance of common stock under equity incentive plan	59,491	$ 51	59,440
Warrant compensation costs	8,985		8,985
Deferred compensation amortization	228,219				228,219
Purchase of treasury stock	(26,629)			(26,629)
Net (loss)	(835,009)					(835,009)
Ending balance (in shares) at Mar. 31, 2020		18,275,577
Ending balance at Mar. 31, 2020	$ 7,003,392	$ 186,707	$ 77,123,698	$ (1,912,081)	$ (5,407,935)	$ (62,986,997)