Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,963,828	$ 4,451,751	$ 6,402,259
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	1,797,281	1,875,102	1,719,154
Impairment of long-lived assets	285,477	0	0
Loss on disposal or abandonment of assets	1,321	3,139	16,985
Non-cash share-based compensation	327,629	239,599	199,870
Deferred income taxes	(90,997)	(215,576)	205,111
Exchange gain	27,984	29,848	18,598
Net changes in assets and liabilities, net of effect of business acquisitions:
Accounts receivable-trade	53,042	99,772	(7,778)
Inventory	3,443,921	(4,133,658)	407,000
Prepaid expenses	239,082	135,713	(284,788)
Other current assets	27,821	(48,797)	(70,035)
Accounts payable-trade	(197,960)	(208,434)	(361,492)
Accrued expenses and other liabilities	(181,959)	(983,710)	(108,365)
Income taxes	(308,129)	923,016	(415,046)
Total adjustments	5,424,513	(2,283,986)	1,319,214
Net cash provided by operating activities	7,388,341	2,167,765	7,721,473
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(1,091,433)	(1,689,645)	(1,697,704)
Proceeds from sale of assets / insurance	27,396	35,963	153,483
(Increase) in other assets	(3,690)	(43,669)	(1,127)
Net cash used in investing activities	(1,067,727)	(1,697,351)	(1,545,348)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from notes payable and long-term debt	1,596,288		3,660,505
Payments on capital lease obligations		(72,686)	(79,396)
Repurchase of common stock (treasury stock)	(1,653,266)		(3,675,654)
Proceeds from exercise of stock options		223,404
Net cash (used in) provided by financing activities	(56,978)	150,718	(94,545)
Effect of exchange rate changes on cash	(530,543)	853,822	(181,891)
NET INCREASE IN CASH	5,733,093	1,474,954	5,899,689
CASH, beginning of period	18,337,258	16,862,304	10,962,615
CASH, end of period	24,070,351	18,337,258	16,862,304
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest paid during the period	304,957	205,555	155,189
Income tax paid during the period, net of refunds	$ 2,138,995	$ 1,788,357	$ 4,215,616