Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss from continuing operations	$ (1,270)	$ (5)
Adjustments to reconcile net loss from continuing operations to cash provided by (used in) operating activities:
Deferred income taxes	(712)	712
Depreciation	1,990	1,935
Amortization	1,465	1,430
Loss on sales and disposals of property, plant, and equipment	10	0
Stock-based compensation	827	680
Change in operating assets and liabilities:
Accounts receivable	(7,213)	(1,221)
Inventories	(429)	3,611
Other current assets	(1,360)	(3,921)
Prepaid income tax	768	(2,258)
Other noncurrent assets	451	(4,939)
Accounts payable	11,435	1,080
Deferred revenue	8,152	2,262
Accrued payroll and employee benefits	(3,495)	(5,678)
Other current liabilities	(2,384)	(3,094)
Other long-term liabilities	(621)	4,504
Net cash provided by (used in) continuing operating activities	7,614	(4,902)
Net cash used in discontinued operating activities	(184)	(1,988)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from the sale of property, plant, and equipment	0	1
Capital expenditures on property, plant, and equipment	(1,327)	(2,806)
Net cash used in continuing investing activities	(1,327)	(2,805)
Net cash used in discontinued investing activities	0	(1,638)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(43,321)	(39,345)
Proceeds from debt	35,026	45,362
Treasury stock acquisitions	(547)	(1,657)
Investment of noncontrolling interest	396	0
Net cash (used in) provided by continuing financing activities	(8,446)	4,360
Net cash used in discontinued financing activities	0	(15)
Effect of exchange rate changes on cash and cash equivalents	(206)	(772)
Net decrease in cash and cash equivalents	(2,549)	(7,760)
Cash and cash equivalents at beginning of period	7,564	14,178
Cash and cash equivalents at end of period	5,015	6,418
Supplemental disclosure of cash flow information:
Interest paid	653	807
Income taxes paid	$ 46	$ 1,173