CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities:
Net income	$ 13,643	$ 17,022	$ 15,925
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	15,985	14,857	11,576
Deferred income taxes	(519)	(112)	(76)
Loss on sale of assets	97	247	19
Provision for doubtful accounts	91	(5)	192
Provision for excess and obsolete inventory	1,106	408	682
Provision for warranty	34	210	(13)
Debt issue cost amortization recorded in interest expense	144	174	148
Restricted stock compensation	3,550	3,203	2,643
Other	(521)	21	57
Changes in operating assets and liabilities, net of acquisition:
Trade receivables	2,711	(1,456)	(4,110)
Inventories	(4,686)	70	(17,327)
Prepaid expenses and other assets	(2,264)	(517)	(835)
Accounts payable	(1,874)	(1,809)	6,533
Accrued liabilities	(2,659)	2,217	2,038
Net cash provided by operating activities	24,838	34,530	17,452
Cash Flows From Investing Activities:
Consideration paid for acquisitions, net of cash acquired	(14,728)		(77,413)
Purchase of property and equipment	(9,371)	(14,882)	(14,333)
Net cash used in investing activities	(24,099)	(14,882)	(91,746)
Cash Flows From Financing Activities:
Repayments on lines of credit			(454)
Principal payments of long-term debt	(16,897)	(22,500)	(13,278)
Proceeds from issuance of long-term debt	26,979	9,639	83,163
Payment of debt issuance costs	(401)		(72)
Sale of restricted stock			1,076
Dividends paid to stockholders	(1,160)	(1,170)	(1,079)
Tax withholdings related to net share settlements of restricted stock	(1,032)	(746)	(1,579)
Net cash provided by (used in) financing activities	7,489	(14,777)	67,777
Effect of foreign exchange rate changes on cash	1,487	(128)	(400)
Net increase (decrease) in cash and cash equivalents	9,715	4,743	(6,917)
Cash and cash equivalents at beginning of period	13,416	8,673	15,590
Cash and cash equivalents at end of period	23,131	13,416	8,673
Supplemental disclosure of cash flow information:
Interest paid	3,586	5,342	2,272
Income taxes paid	8,563	2,051	7,014
Property, plant and equipment purchases in accounts payable or accrued expenses	$ 596	$ 378	$ 599