Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Activities:
Net income	$ 4,052,479	$ 5,850,998
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,722,568	1,490,805
Amortization	1,172,292	930,941
Stock compensation expense	684,351	440,536
Deferred income taxes	660,703	100,529
Changes in operating assets and liabilities
Accounts receivable	(5,230,159)	499,940
Inventories	(1,846,765)	(1,483,785)
Prepaid expenses and other current assets	82,679	314,824
Accounts payable	3,733,667	610,498
Other accrued liabilities	(220,939)	101,927
Total adjustments	758,397	3,006,214
Net cash provided by operating activities	4,810,876	8,857,211
Investing Activities:
Purchase of plant, property and equipment	(3,146,194)	(1,809,823)
Purchase of patents and trademarks		(29,371)
Purchase of building	(4,000,000)
Acquisitions (Note 17)	(7,233,114)	(6,970,910)
Net cash used by investing activities	(14,379,308)	(8,810,104)
Financing Activities:
Net borrowings of long-term debt	10,514,417	7,023,205
Borrowings on mortgage	4,000,000
Repayments on mortgage	(22,222)
Distributions to shareholders	(1,408,428)	(1,332,757)
Cash settlement of stock options	(823,530)	(2,274,374)
Excess tax benefit from the exercise of stock options		567,309
Purchase of treasury stock		(907,094)
Issuance of common stock	649,231	394,538
Net cash provided by financing activities	12,909,468	3,470,827
Effect of exchange rate changes	86,463	(33,056)
Net increase in cash and cash equivalents	3,427,499	3,484,880
Cash and cash equivalents at beginning of year	5,910,770	2,425,891
Cash and cash equivalents at end of year	9,338,269	5,910,770
Supplemental cash flow information
Cash paid for income taxes	1,570,370	1,779,879
Cash paid for interest expense	$ 1,255,190	$ 841,634