RESTATEMENT OF PREVIOUSLY ISSUED CONSOLIDATED FINANCIAL STATEMENTS, Consolidated Statements of Cash Flows (Details) - 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		Dec. 31, 2017
Cash flows from operating activities [Abstract]
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)	[1]	$ 4,398,365	[2]	$ 2,478,444	[2]
Adjustments to reconcile net income (loss) to net cash provided by operating activities [Abstract]
Depreciation and amortization				494,295						466,633		880,094		1,312,830		1,655,223		1,798,762	[2]	1,884,043	[2]
Right-of-use asset amortization				865,050												3,481,931		0	[2]	0	[2]
Impairment of goodwill and long-lived assets																1,001,835		285,477	[2]	0	[2]
(Gain) loss on disposal of assets				(3,794)						1,929		4,556		4,556		8,795		1,321	[2]	3,139	[2]
Stock-based compensation				185,825						28,969		52,688		76,447		770,188		327,629	[2]	239,599	[2]
Deferred income taxes				183,793						82,765		(154,643)		(290,291)		(334,343)		257,249	[2]	638,056	[2]
Exchange (gain) loss				136,267						(121,723)		(215,866)		(136,898)		137,241		(406,832)	[2]	32,999	[2]
Changes in operating assets and liabilities [Abstract]
Accounts receivable - trade				(56,063)						(298,158)		(22,534)		(10,900)		(22,703)		49,155	[2]	88,445	[2]
Inventory				3,172,163						521,525		(688,434)		(3,961,731)		9,329,998		1,034,430	[2]	(2,978,285)	[2]
Prepaid expenses				32,552						1,620,091		165,857		34,501		596,071		71,915	[2]	66,812	[2]
Other current assets				(193,647)						(1,197,098)		0		0		(96,492)		0	[2]	0	[2]
Accounts payable - trade				(1,281,147)						(1,012,412)		721,717		1,403,219		3,499,627		(148,340)	[2]	764,889	[2]
Accrued expenses and other liabilities				(1,155,895)						(532,200)		(1,920,897)		(1,652,826)		(2,718,611)		314,937	[2]	(2,266,301)	[2]
Income taxes				108,710						136,504		(202,651)		(418,970)		(1,219,596)		(795,609)	[2]	1,148,313	[2]
Other assets				(41,970)						77,175		422,302		352,313		(325,691)		583,281	[2]	365,622	[2]
Operating lease liability				(833,690)												(3,388,399)		0	[2]	0	[2]
Total adjustments				1,612,449						(226,000)		(957,811)		(3,287,750)		12,375,074		3,373,375	[2]	(12,669)	[2]
Net cash provided by operating activities				3,132,260						1,290,656		1,716,588		(4,650)		10,471,293		7,771,740	[2]	2,465,775	[2]
Cash flows from investing activities [Abstract]
Purchase of property and equipment				(30,900)						(17,621)		(421,861)		(887,679)		(268,961)		(1,088,328)	[2]	(1,691,999)	[2]
Purchase of short-term investments - US treasuries				(4,999,750)												(18,094,775)		0	[2]	0	[2]
Proceeds from sales of assets				12,552								7,028		17,718		112,589		27,939	[2]	35,963	[2]
Net cash used in investing activities				(5,018,098)						(17,621)		(414,833)		(869,961)		(9,156,147)		(1,060,389)	[2]	(1,656,036)	[2]
Cash flows from financing activities [Abstract]
Proceeds from long-term debt										540,940		982,938		982,939		0		1,596,288	[2]	0	[2]
Payments on long-term debt				(8,968,018)												(8,968,018)		0	[2]	0	[2]
Repurchase of treasury stock				(714,617)						(540,940)		(995,186)		(995,238)		(735,199)		(1,653,266)	[2]	0	[2]
Payments on capital lease obligations																0		0	[2]	(72,686)	[2]
Proceeds from exercise of stock options																0		0	[2]	223,404	[2]
Net cash (used in) provided by financing activities				(9,682,635)						0		(12,248)		(12,299)		(9,703,217)		(56,978)	[2]	150,718	[2]
Effect of exchange rate changes on cash and cash equivalents				177,495						(103,014)		(417,036)		(380,975)		222,878		(666,879)	[2]	260,096	[2]
Net (decrease) increase in cash and cash equivalents				(11,390,978)						1,170,021		872,471		(1,267,885)		(8,165,193)		5,987,494	[2]	1,220,553	[2]
Cash and cash equivalents, beginning of period			12,679,373	24,070,351	[2]	16,814,972		18,955,328	19,252,878	18,082,857	[2]	18,082,857	[2]	18,082,857	[2]	24,070,351	[2]	18,082,857	[2]	16,862,304	[2]
Cash and cash equivalents, end of period	$ 15,905,158			12,679,373		24,070,351	[2]	16,814,972	18,955,328	19,252,878		18,955,328		16,814,972		15,905,158		24,070,351	[2]	18,082,857	[2]
Supplemental disclosures of cash flow information [Abstract]
Interest paid during the period																36,260		304,957	[2]	205,555	[2]
Income tax paid during the period, net of refunds																714,620		1,361,400	[2]	2,243,018	[2]
As Reported [Member]
Cash flows from operating activities [Abstract]
Net income (loss)				868,963				(121,534)	1,440,092	1,273,619		2,713,711		2,592,177				1,963,828		4,451,751
Adjustments to reconcile net income (loss) to net cash provided by operating activities [Abstract]
Depreciation and amortization				495,449						465,522		878,955		1,310,774				1,797,281		1,875,102
Right-of-use asset amortization				0
Impairment of goodwill and long-lived assets																		285,477
(Gain) loss on disposal of assets				(3,794)						798		4,556		4,556				1,321		3,139
Stock-based compensation				185,825						28,969		52,688		76,447				327,629		239,599
Deferred income taxes				(33,861)						(49,498)		(96,057)		(115,460)				(90,997)		(215,576)
Exchange (gain) loss				2,154						2,994		(268,321)		(93,163)				27,984		29,848
Changes in operating assets and liabilities [Abstract]
Accounts receivable - trade				(48,367)						(42,110)		(35,043)		42,600				53,042		99,772
Inventory				3,302,954						539,337		(709,072)		(3,409,433)				3,443,921		(4,133,658)
Prepaid expenses				(292,613)						(103,058)		98,203		125,034				239,082		135,713
Other current assets				(12,835)						110,617		113,570		(111,688)				27,821		(48,797)
Accounts payable - trade				(318,294)						6,055		(189,928)		28,525				(197,960)		(208,434)
Accrued expenses and other liabilities				(1,205,241)						(1,246,439)		(1,258,506)		(609,577)				(181,959)		(983,710)
Income taxes				95,767						146,483		(255,695)		(475,082)				(308,129)		923,016
Other assets				6,446						957		(3,910)		(5,736)				(3,690)		(43,669)
Operating lease liability				0
Total adjustments				2,173,590						(139,373)		(1,668,560)		(3,232,203)				5,420,823		(2,327,655)
Net cash provided by operating activities				3,042,553						1,134,246		1,045,151		(640,026)				7,384,651		2,124,096
Cash flows from investing activities [Abstract]
Purchase of property and equipment				(30,893)						(240,020)		(421,861)		(887,679)				(1,091,433)		(1,689,645)
Purchase of short-term investments - US treasuries				(4,999,750)
Proceeds from sales of assets				12,552								7,028		17,718				27,396		35,963
Net cash used in investing activities				(5,018,091)						(240,020)		(414,833)		(869,961)				(1,064,037)		(1,653,682)
Cash flows from financing activities [Abstract]
Proceeds from long-term debt										540,940		982,938		982,939				1,596,288
Payments on long-term debt				(8,968,018)
Repurchase of treasury stock				(714,617)						(540,940)		(995,186)		(995,238)				(1,653,266)
Payments on capital lease obligations																				(72,686)
Proceeds from exercise of stock options																				223,404
Net cash (used in) provided by financing activities				(9,682,635)						0		(12,248)		(12,299)				(56,978)		150,718
Effect of exchange rate changes on cash and cash equivalents				267,195						21,394		0		0				(530,543)		853,822
Net (decrease) increase in cash and cash equivalents				(11,390,978)						915,620		618,070		(1,522,286)				5,733,093		1,474,954
Cash and cash equivalents, beginning of period			12,679,373	24,070,351		16,814,972		18,955,328	19,252,878	18,337,258		18,337,258		18,337,258		24,070,351		18,337,258		16,862,304
Cash and cash equivalents, end of period				12,679,373		24,070,351		16,814,972	18,955,328	19,252,878		18,955,328		16,814,972				24,070,351		18,337,258
Supplemental disclosures of cash flow information [Abstract]
Interest paid during the period																		304,957		205,555
Income tax paid during the period, net of refunds																		2,138,995		1,788,357
Adjustments [Member]
Cash flows from operating activities [Abstract]
Net income (loss)				650,848				730,235	(282,349)	243,037		(39,312)		690,923				2,434,537		(1,973,307)
Adjustments to reconcile net income (loss) to net cash provided by operating activities [Abstract]
Depreciation and amortization				(1,154)						1,111		1,139		2,056				1,481		8,941
Right-of-use asset amortization				865,050
Impairment of goodwill and long-lived assets																		0
(Gain) loss on disposal of assets				0						1,131		0		0				0		0
Stock-based compensation				0						0		0		0				0		0
Deferred income taxes				217,654						132,263		(58,586)		(174,831)				348,246		853,632
Exchange (gain) loss				134,113						(124,717)		52,455		(43,735)				(434,816)		3,151
Changes in operating assets and liabilities [Abstract]
Accounts receivable - trade				(7,696)						(256,048)		12,509		(53,500)				(3,887)		(11,327)
Inventory				(130,791)						(17,812)		20,638		(552,298)				(2,409,491)		1,155,373
Prepaid expenses				325,165						1,723,149		67,654		(90,533)				(167,167)		(68,901)
Other current assets				(180,812)						(1,307,715)		(113,570)		111,688				(27,821)		48,797
Accounts payable - trade				(962,853)						(1,018,467)		911,645		1,374,694				49,620		973,323
Accrued expenses and other liabilities				49,346						714,239		(662,391)		(1,043,249)				496,896		(1,282,591)
Income taxes				12,943						(9,979)		53,044		56,112				(487,480)		225,297
Other assets				(48,416)						76,218		426,212		358,049				586,971		409,291
Operating lease liability				(833,690)
Total adjustments				(561,141)						(86,627)		710,749		(55,547)				(2,047,448)		2,314,986
Net cash provided by operating activities				89,707						156,410		671,437		635,376				387,089		341,679
Cash flows from investing activities [Abstract]
Purchase of property and equipment				(7)						222,399		0		0				3,105		(2,354)
Purchase of short-term investments - US treasuries				0
Proceeds from sales of assets				0								0		0				543		0
Net cash used in investing activities				(7)						222,399		0		0				3,648		(2,354)
Cash flows from financing activities [Abstract]
Proceeds from long-term debt										0		0		0				0
Payments on long-term debt				0
Repurchase of treasury stock				0						0		0		0				0
Payments on capital lease obligations																				0
Proceeds from exercise of stock options																				0
Net cash (used in) provided by financing activities				0						0		0		0				0		0
Effect of exchange rate changes on cash and cash equivalents				(89,700)						(124,408)		(417,036)		(380,975)				(136,336)		(593,726)
Net (decrease) increase in cash and cash equivalents				0						254,401		254,401		254,401				254,401		(254,401)
Cash and cash equivalents, beginning of period			$ 0	0		0		0	0	(254,401)		(254,401)		(254,401)		$ 0		(254,401)		0
Cash and cash equivalents, end of period				$ 0		$ 0		$ 0	$ 0	$ 0		$ 0		$ 0				0		(254,401)
Supplemental disclosures of cash flow information [Abstract]
Interest paid during the period																		0		0
Income tax paid during the period, net of refunds																		$ (777,595)		$ 454,661

[1] 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.

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