Consolidated Statement of Changes in Stockholders' Equity - USD ($)	Total	Private Placement	Common Stock	Common Stock Private Placement	Additional Paid - In Capital	Additional Paid - In Capital Private Placement	Treasury Stock	Deferred Compensation	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017			16,874,235
Beginning balance at Dec. 31, 2017	$ 13,123,353		$ 186,299		$ 74,041,083		$ (831,059)	$ (7,012,544)	$ (53,260,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity incentive plan (in shares)			68,889
Issuance of common stock under equity incentive plan	147,300		$ 69		147,231
Deferred compensation amortization	227,078							227,078
Purchase of treasury stock	(956,134)						(956,134)
Net (loss)	(1,050,806)								(1,050,806)
Ending balance (in shares) at Mar. 31, 2018			16,943,124
Ending balance at Mar. 31, 2018	11,490,791		$ 186,368		74,188,314		(1,787,193)	(6,785,466)	(54,311,232)
Beginning balance (in shares) at Dec. 31, 2017			16,874,235
Beginning balance at Dec. 31, 2017	13,123,353		$ 186,299		74,041,083		(831,059)	(7,012,544)	(53,260,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss)	(2,899,410)
Ending balance (in shares) at Sep. 30, 2018			17,020,180
Ending balance at Sep. 30, 2018	10,227,364		$ 185,447		74,371,930		(1,797,442)	(6,372,735)	(56,159,836)
Beginning balance (in shares) at Mar. 31, 2018			16,943,124
Beginning balance at Mar. 31, 2018	11,490,791		$ 186,368		74,188,314		(1,787,193)	(6,785,466)	(54,311,232)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity incentive plan (in shares)			28,223
Issuance of common stock under equity incentive plan	74,347		$ 28		74,319
Issuance of common stock, employees, restricted (in shares)			100,000
Issuance of common stock, employees, restricted	0		$ 100		179,900			(180,000)
Issuance of common stock, restricted (in shares)			5,000
Issuance of common stock, restricted	7,911		$ 5		7,906
Deferred compensation amortization	229,655							229,655
Reversal of deferred compensation that did not vest (in shares)			(6,667)
Reversal of deferred compensation that did not vest	(5,525)		$ (1,000)		(16,000)			11,475
Purchase of treasury stock	(2,942)						(2,942)
Net (loss)	(1,035,438)								(1,035,438)
Ending balance (in shares) at Jun. 30, 2018			17,069,680
Ending balance at Jun. 30, 2018	10,758,799		$ 185,501		74,434,439		(1,790,135)	(6,724,336)	(55,346,670)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity incentive plan (in shares)			10,500
Issuance of common stock under equity incentive plan	70,032		$ 11		70,021
Deferred compensation amortization	219,006							219,006
Reversal of deferred compensation that did not vest (in shares)			(60,000)
Reversal of deferred compensation that did not vest	0		$ (65)		(132,530)			132,595
Purchase of treasury stock	(7,307)						(7,307)
Net (loss)	(813,166)								(813,166)
Ending balance (in shares) at Sep. 30, 2018			17,020,180
Ending balance at Sep. 30, 2018	10,227,364		$ 185,447		74,371,930		(1,797,442)	(6,372,735)	(56,159,836)
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, 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]
Net (loss)	(3,587,534)
Ending balance (in shares) at Sep. 30, 2019			18,011,077
Ending balance at Sep. 30, 2019	8,769,235		$ 186,442		76,658,269		(1,866,130)	(5,585,571)	(60,623,775)
Beginning balance (in shares) at Mar. 31, 2019			17,961,132
Beginning balance at Mar. 31, 2019	10,625,313		$ 186,392		76,429,299		(1,835,368)	(6,045,880)	(58,109,130)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity incentive plan (in shares)			53,445
Issuance of common stock under equity incentive plan	133,515		$ 53		133,462
Warrant compensation costs	8,985				8,985
Deferred compensation amortization	222,585							222,585
Reversal of deferred compensation that did not vest (in shares)			(6,000)
Reversal of deferred compensation that did not vest	0		$ (6)		(13,254)			13,260
Purchase of treasury stock	(28,693)						(28,693)
Net (loss)	(1,275,611)								(1,275,611)
Ending balance (in shares) at Jun. 30, 2019			18,008,577
Ending balance at Jun. 30, 2019	9,686,094		$ 186,439		76,558,492		(1,864,061)	(5,810,035)	(59,384,741)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under equity incentive plan (in shares)			2,500
Issuance of common stock under equity incentive plan	92,486		$ 3		92,483
Warrant compensation costs	8,985				8,985
Deferred compensation amortization	224,464							224,464
Reversal of deferred compensation that did not vest	(1,691)				(1,691)
Purchase of treasury stock	(2,069)						(2,069)
Net (loss)	(1,239,034)								(1,239,034)
Ending balance (in shares) at Sep. 30, 2019			18,011,077
Ending balance at Sep. 30, 2019	$ 8,769,235		$ 186,442		$ 76,658,269		$ (1,866,130)	$ (5,585,571)	$ (60,623,775)