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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income (loss) $ (2,910) $ 6,993
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 6,045 6,319
Provision for credit losses (204) 2
Deferred income taxes 269 894
Shares issued for employee benefit plan 324 410
Employee and director stock-based compensation 2,499 2,600
Performance-based common stock warrants 0 143
Changes in operating assets and liabilities:    
Accounts receivable and contract assets (5,087) (10,126)
Inventories (4,599) 1,338
Prepaid expenses and other assets (1,464) 384
Accounts payable and accrued liabilities (13,174) (12,546)
Accrued income taxes 332 (3,140)
Net cash provided by (used for) operating activities (17,969) (6,729)
Cash flows from investing activities:    
Term deposit (7,487) 0
Acquisition of net assets of Qterics, Inc. (939) 0
Acquisitions of property, plant and equipment (1,785) (3,698)
Acquisitions of intangible assets (1,410) (1,106)
Net cash used for investing activities (11,621) (4,804)
Cash flows from financing activities:    
Borrowings under line of credit 42,000 30,000
Repayments on line of credit (13,000) (10,000)
Proceeds from stock options exercised 0 991
Treasury stock purchased (7,354) (10,951)
Net cash provided by (used for) financing activities 21,646 10,040
Effect of foreign currency exchange rates on cash and cash equivalents 759 (297)
Net increase (decrease) in cash and cash equivalents (7,185) (1,790)
Cash and cash equivalents at beginning of period 60,813 57,153
Cash and cash equivalents at end of period 53,628 55,363
Supplemental cash flow information:    
Income taxes paid 1,375 3,473
Interest paid $ 302 $ 104