CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ (24,029)	$ (98,238)	$ 407
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Depreciation and amortization	18,058	22,927	24,033
Provision for credit losses	1,081	70	(182)
Deferred income taxes	(256)	(1,149)	1,377
Shares issued for employee benefit plan	1,063	1,293	1,199
Employee and director stock-based compensation	6,700	8,809	10,013
Impairment of goodwill	0	49,075	0
Impairment of long-lived assets	333	7,963	2,888
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(12,174)	5,040	12,765
Inventories	6,239	51,458	(9,913)
Prepaid expenses and other assets	764	2,860	(917)
Accounts payable and accrued liabilities	15,733	(21,379)	(28,670)
Accrued income taxes	1,310	(3,539)	(2,074)
Net cash provided by (used for) operating activities	14,822	25,190	10,926
Cash flows from investing activities:
Purchase of term deposit	0	0	(7,487)
Redemption of term deposit	0	0	7,803
Acquisition of the net assets of Qterics, Inc.	0	0	(939)
Acquisitions of property, plant and equipment	(4,572)	(8,116)	(14,006)
Acquisitions of intangible assets	(3,856)	(5,761)	(6,579)
Net cash provided by (used for) investing activities	(8,428)	(13,877)	(21,208)
Cash flows from financing activities:
Borrowings under lines of credit	102,193	78,000	133,000
Repayments on lines of credit	(120,000)	(111,000)	(101,000)
Proceeds from stock options exercised	0	0	1,536
Treasury stock purchased	(1,957)	(1,779)	(13,035)
Net cash provided by (used for) financing activities	(19,764)	(34,779)	20,501
Effect of foreign currency exchange rate changes on cash and cash equivalents	(2,598)	(523)	(4,292)
Net increase (decrease) in cash and cash equivalents	(15,968)	(23,989)	5,927
Cash and cash equivalents at beginning of period	42,751	66,740	60,813
Cash and cash equivalents at end of period	26,783	42,751	66,740
Supplemental cash flow information:
Income taxes paid	3,481	13,176	10,922
Interest paid	$ 4,738	$ 7,015	$ 2,214