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, 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)