Consolidated Statements of Comprehensive Income (Loss) - USD ($)	3 Months Ended												6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019		Dec. 31, 2018	[1]	Dec. 31, 2017	[1]
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net sales							$ 20,941,322			$ 18,878,263	$ 19,187,222	$ 20,500,578	$ 39,687,800	$ 58,566,063	$ 74,918,160		$ 83,203,569		$ 82,420,595
Cost of sales							8,696,652			6,982,380	6,953,730	7,811,518	14,765,248	21,747,628	32,958,708		32,262,624		33,334,934
Gross profit (loss)	$ 11,495,688		$ 8,848,648		$ 9,370,446		12,244,670		$ 14,122,510	11,895,883	12,233,492	12,689,060	24,922,552	36,818,435	41,959,452		50,940,945		49,085,661
Operating expenses							10,031,653			10,995,989	10,651,386	10,634,923	21,286,309	32,282,298	43,555,826		44,692,265		42,708,942
Impairment expense															1,001,835		285,477		0
Income (loss) from operations							2,213,017			899,894	1,582,106	2,054,137	3,636,243	4,536,137	(2,598,209)		5,963,203		6,376,719
Other (income) expense:
Interest expense							32,383			80,710	78,182	64,642	142,824	223,534	36,260		304,957		205,555
Other, net							109,618			(40,846)	(131,842)	(153,378)	(285,220)	(326,066)	(40,225)		(553,573)		(167,112)
Total other (income) expense							142,001			39,864	(53,660)	(88,736)	(142,396)	(102,532)	(3,965)		(248,616)		38,443
Income (loss) before income taxes							2,071,016			860,030	1,635,766	2,142,873	3,778,639	4,638,669	(2,594,244)		6,211,819		6,338,276
Provision (benefit) for income taxes							551,205			251,329	478,023	626,217	1,104,240	1,355,569	(690,463)		1,813,454		3,859,832
Net income (loss)	$ (829,473)		$ (1,718,452)		$ (875,667)		1,519,811		$ 1,115,265	608,701	1,157,743	1,516,656	2,674,399	3,283,100	(1,903,781)	[2]	4,398,365		2,478,444
Foreign currency translation adjustments, net of tax							314,493			88,624	(284,774)	(58,992)	(343,766)	(255,142)	363,639		(681,872)		411,427
Comprehensive income (loss)							$ 1,834,304			$ 697,325	$ 872,969	$ 1,457,664	$ 2,330,633	$ 3,027,958	$ (1,540,142)		$ 3,716,493		$ 2,889,871
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.09)		$ (0.19)		$ (0.10)		$ 0.17		$ 0.12	$ 0.07	$ 0.13	$ 0.16	$ 0.29	$ 0.36	$ (0.21)		$ 0.48		$ 0.27
Diluted (in dollars per share)	$ (0.09)	[3]	$ (0.19)	[3]	$ (0.10)	[3]	$ 0.17	[3]	$ 0.12	$ 0.07	$ 0.13	$ 0.16	$ 0.29	$ 0.36	$ (0.21)		$ 0.48		$ 0.27
Weighted average number of shares outstanding:
Basic (in shares)	9,020,187		8,932,246		8,933,648		9,009,752		9,143,746	9,154,215	9,180,076	9,264,446	9,222,028	9,199,173	8,973,246	[2]	9,185,203		9,242,092
Diluted (in shares)	9,020,187		8,932,246		8,933,648		9,011,107		9,144,020	9,160,022	9,182,527	9,264,604	9,223,086	9,201,577	8,973,246	[2]	9,205,008		9,245,537

[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.

[3] For the three months ended June 30, 2019, September 31, 2019 and December 31, 2019, there were 2,290, 2,704 and 8,387 shares, respectively, excluded from the diluted EPS calculation because the impact of their assumed exercise would be anti-dilutive due to a net loss in those periods.