Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 6,402,259	$ 6,402,405	$ 7,706,921
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation and amortization	1,719,154	1,567,172	1,436,624
Loss on disposal or abandonment of assets	16,985	31,064	18,820
Non-cash share-based compensation	199,870	145,322	67,818
Deferred income taxes	205,111	289,171	183,490
Foreign currency translation	(163,292)	(896,928)	(727,664)
Net changes in assets and liabilities, net of effect of business acquisitions:
Accounts receivable-trade	(7,778)	71,848	137,351
Inventory	407,000	(709,047)	(6,574,662)
Prepaid expenses	(284,788)	43,585	260,992
Other current assets	(70,035)	87,561	320,835
Accounts payable-trade	(361,492)	728,158	(629,419)
Accrued expenses and other liabilities	(108,365)	651,038	(414,368)
Income taxes	(415,046)	(212,449)	(609,026)
Total adjustments	1,137,324	1,796,495	(6,529,209)
Net cash provided by operating activities	7,539,583	8,198,900	1,177,712
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(1,697,704)	(2,164,040)	(2,204,190)
Purchase of intangible property		(10,000)
Proceeds from sale of assets / insurance	153,483	11,662	20,936
Decrease (increase) in other assets	(1,127)	295	11,980
Net cash used in investing activities	(1,545,348)	(2,162,083)	(2,171,274)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in revolving credit loans		(3,500,000)	3,500,000
Proceeds from notes payable and long term debt	3,660,505	3,711,225
Payments on notes payable and long-term debt		(2,143,125)	(455,625)
Payments on capital lease obligations	(79,396)	(79,890)
Repurchase of common stock (treasury stock)	(3,675,654)	(3,708,862)
Payment of cash dividend			(2,549,684)
Proceeds from issuance of common stock	0	9,920	52,722
Net cash provided by (used in) financing activities	(94,545)	(5,710,732)	547,413
NET INCREASE (DECREASE) IN CASH	5,899,689	326,085	(446,149)
CASH, beginning of period	10,962,615	10,636,530	11,082,679
CASH, end of period	16,862,304	10,962,615	10,636,530
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest paid during the period	155,189	330,004	225,584
Income tax paid during the period, net of (refunds)	4,215,616	3,743,864	4,604,087
NON-CASH INVESTING ACTIVITIES
Equipment purchased via capital lease arrangements		$ 231,972