Consolidated Statements of Stockholders' Equity - USD ($)		Common Stock [Member]		Paid-in Capital [Member]		Treasury Stock [Member]		Retained Earnings [Member]		Accumulated Other Comprehensive Income (Loss) [Member]		Total		Previously Reported [Member] Common Stock [Member]	Previously Reported [Member] Paid-in Capital [Member]	Previously Reported [Member] Treasury Stock [Member]	Previously Reported [Member] Retained Earnings [Member]	Previously Reported [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Previously Reported [Member]	Restatement Adjustment [Member] Common Stock [Member]	[1]	Restatement Adjustment [Member] Paid-in Capital [Member]	[1]	Restatement Adjustment [Member] Treasury Stock [Member]	[1]	Restatement Adjustment [Member] Retained Earnings [Member]	[1]	Restatement Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Member]	[1]	Restatement Adjustment [Member]		Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2016		$ 24,582	[1]	$ 3,476,772	[1]	$ (7,384,517)	[1]	$ 57,599,569	[1]	$ (1,173,740)	[1]	$ 52,542,666	[1]	$ 27,142	$ 6,368,279	$ (10,278,584)	$ 59,469,493	$ (1,893,129)	$ 53,693,201	$ (2,560)		$ (2,891,507)		$ 2,894,067		$ (1,869,924)		$ 719,389		$ (1,150,535)	[1]
Balance (in shares) at Dec. 31, 2016												9,193,162	[1]						9,193,162											0	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		0		239,599		0		0		0		$ 239,599
Issuance of restricted stock		$ 79		(79)		0		0		0		0
Issuance of restricted stock (in shares)		33,300
Shares issued - stock options exercised		$ 107		223,297		0		0		0		223,404
Shares issued - stock options exercised (in shares)		44,400
Net income (loss)		$ 0		0		0		2,478,444		0		2,478,444	[1]						$ 4,451,751											$ (1,973,307)
Foreign currency translation adjustments, net of tax		0		0		0		0		411,427		411,427	[1]						931,026											(519,599)
Balance at Dec. 31, 2017		24,768	[1]	3,939,589	[1]	(7,384,517)	[1]	60,078,013	[1]	(762,313)	[1]	$ 55,895,540	[1]						59,538,981											(3,643,441)
Balance (in shares) at Dec. 31, 2017	[1]											9,270,862
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)												$ 1,516,656							1,273,619											243,037
Foreign currency translation adjustments, net of tax												(58,992)							21,791											(80,783)
Balance at Mar. 31, 2018												56,841,234							60,154,109											(3,312,875)
Balance at Dec. 31, 2017		24,768	[1]	3,939,589	[1]	(7,384,517)	[1]	60,078,013	[1]	(762,313)	[1]	$ 55,895,540	[1]						59,538,981											(3,643,441)
Balance (in shares) at Dec. 31, 2017	[1]											9,270,862
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)												$ 2,674,399							2,713,711											(39,312)
Foreign currency translation adjustments, net of tax												(343,766)							(272,807)											(70,959)
Balance at Jun. 30, 2018												57,283,675							60,869,076											(3,585,401)
Balance at Dec. 31, 2017		24,768	[1]	3,939,589	[1]	(7,384,517)	[1]	60,078,013	[1]	(762,313)	[1]	$ 55,895,540	[1]						59,538,981											(3,643,441)
Balance (in shares) at Dec. 31, 2017	[1]											9,270,862
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)												$ 3,283,100							2,592,177											690,923
Foreign currency translation adjustments, net of tax												(255,142)							(154,642)											(100,500)
Balance at Sep. 30, 2018												58,004,707							60,889,414											(2,884,707)
Balance at Dec. 31, 2017		24,768	[1]	3,939,589	[1]	(7,384,517)	[1]	60,078,013	[1]	(762,313)	[1]	$ 55,895,540	[1]						59,538,981											(3,643,441)
Balance (in shares) at Dec. 31, 2017	[1]											9,270,862
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		0		327,629		0		0		0		$ 327,629
Issuance of restricted stock		$ 80		(80)		0		0		0		0
Issuance of restricted stock (in shares)		33,086
Purchase of treasury stock		$ 0		0		$ (1,653,266)		0		0		$ (1,653,266)
Purchase of treasury stock (in shares)						(243,387)						(243,387)
Net income (loss)		0		0		$ 0		4,398,365		0		$ 4,398,365	[1]						1,963,828											2,434,537
Foreign currency translation adjustments, net of tax		0		0		0		0		(681,872)		(681,872)	[1]						(548,557)											(133,315)
Balance at Dec. 31, 2018		24,848	[1]	4,267,138	[1]	(9,037,783)	[1]	64,476,378	[1]	(1,444,185)	[1]	$ 58,286,396	[1]						59,460,304											(1,173,908)
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018																																$ 0	$ (361,816)	$ 0	$ (361,816)
Balance (in shares) at Dec. 31, 2018	[1]											9,060,561
Balance at Mar. 31, 2018												$ 56,841,234							60,154,109											(3,312,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)												1,157,743							1,440,092											(282,349)
Foreign currency translation adjustments, net of tax												(284,774)							(294,598)											9,824
Balance at Jun. 30, 2018												57,283,675							60,869,076											(3,585,401)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)												608,701							(121,534)											730,235
Foreign currency translation adjustments, net of tax												88,624							118,165											(29,541)
Balance at Sep. 30, 2018												58,004,707							60,889,414											(2,884,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)												1,115,265
Balance at Dec. 31, 2018		24,848	[1]	4,267,138	[1]	(9,037,783)	[1]	64,476,378	[1]	(1,444,185)	[1]	$ 58,286,396	[1]						59,460,304											(1,173,908)
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018																																0	(361,816)	0	(361,816)
Balance (in shares) at Dec. 31, 2018	[1]											9,060,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)												$ 1,519,811							868,963											650,848
Foreign currency translation adjustments, net of tax												314,493							287,295											27,198
Balance at Mar. 31, 2019												59,230,090							59,690,660											(460,570)
Balance at Dec. 31, 2018		24,848	[1]	4,267,138	[1]	(9,037,783)	[1]	64,476,378	[1]	(1,444,185)	[1]	$ 58,286,396	[1]						$ 59,460,304											$ (1,173,908)
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018																																$ 0	$ (361,816)	$ 0	$ (361,816)
Balance (in shares) at Dec. 31, 2018	[1]											9,060,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		0		770,188		0		0		0		$ 770,188
Issuance of restricted stock		$ 224		(224)		0		0		0		0
Issuance of restricted stock (in shares)		93,408
Purchase of treasury stock		$ 0		0		$ (735,199)		0		0		$ (735,199)
Purchase of treasury stock (in shares)						(131,782)						(131,782)
Net income (loss)		0		0		$ 0		(1,903,781)		0		$ (1,903,781)	[2]
Foreign currency translation adjustments, net of tax		0		0		0		0		363,639		363,639
Balance at Dec. 31, 2019		$ 25,072		$ 5,037,102		$ (9,772,982)		$ 62,210,781		$ (1,080,546)		$ 56,419,427
Balance (in shares) at Dec. 31, 2019												9,022,187

[1] As described in Note 2 to these Consolidated Financial Statements, we have restated the Consolidated Financial Statements.

[2] For the year ended December 31, 2019, there were 9,203 shares excluded from the diluted EPS calculation because the impact of their assumed vesting would be anti-dilutive due to a net loss in that period.