Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Income from continuing operations	$ 3,471	$ 25,823
Adjustments to reconcile net income to cash (used in) provided by continuing operating activities:
Deferred income taxes	139	(4,317)
Depreciation	8,051	7,850
Amortization	5,836	5,729
Equity income in nonconsolidated investment	(7)	(20)
Loss on sales and disposals of property, plant, and equipment	51	47
Loss on derivative	0	273
Stock-based compensation	1,945	1,136
Gain on asset divestiture	(2,741)	0
Change in operating assets and liabilities:
Accounts receivable	2,294	15,722
Contract assets	1,325	52
Inventories	(3,973)	3,227
Other current assets	261	583
Prepaid income tax	106	(9,108)
Other noncurrent assets	158	(2,870)
Accounts payable	(13,641)	(8,947)
Deferred revenue	6,285	(1,315)
Accrued payroll and employee benefits	344	(4,085)
Accrued settlement	(8,000)	(8,000)
Other current liabilities	(2,407)	(4,074)
Other liabilities	(307)	2,843
Net cash (used in) provided by continuing operating activities	(810)	20,549
Net cash used in discontinued operating activities	(253)	(3,631)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of property, plant, and equipment	30	16
Capital expenditures on property, plant, and equipment	(4,620)	(9,179)
Acquisition	(229)	(1,156)
Proceeds from asset divestiture	22,707	0
Capital contributions to nonconsolidated investment	(66)	0
Net cash provided by (used in) continuing investing activities	17,822	(10,319)
Net cash provided by discontinued investing activities	0	2,278
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(183,372)	(172,892)
Proceeds from debt	169,637	159,778
Debt issuance costs	(406)	(498)
Treasury stock acquisitions	(732)	(1,665)
Investment of noncontrolling interest	969	0
Net cash used in continuing financing activities	(13,904)	(15,277)
Net cash used in discontinued financing activities	0	(19)
Effect of exchange rate changes on cash and cash equivalents	(47)	(195)
Net increase (decrease) in cash and cash equivalents	2,808	(6,614)
Cash and cash equivalents at beginning of period	7,564	14,178
Cash and cash equivalents at end of period	10,372	7,564
Supplemental disclosure of cash flow information:
Interest paid	2,615	3,266
Income taxes paid	$ 1,491	$ 2,625