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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income (loss) $ 7,312 $ 11,631
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 18,079 19,719
Provision for credit losses (204) 1
Deferred income taxes 2,063 (483)
Shares issued for employee benefit plan 952 977
Employee and director stock-based compensation 7,575 7,516
Performance-based common stock warrants 0 398
Loss on sale of Argentina subsidiary, net of cash transferred 0 5,960
Changes in operating assets and liabilities:    
Accounts receivable and contract assets (11,901) (12,129)
Inventories (8,477) (4,466)
Prepaid expenses and other assets 1,734 2,872
Accounts payable and accrued liabilities (17,201) (7,416)
Accrued income taxes 171 (1,664)
Net cash provided by (used for) operating activities 103 22,916
Cash flows from investing activities:    
Purchase of term deposit (7,487) 0
Redemption of term deposit 7,609 0
Acquisition of net assets of Qterics, Inc. (939) 0
Acquisitions of property, plant and equipment (10,117) (8,782)
Acquisitions of intangible assets (4,719) (3,626)
Net cash provided by (used for) investing activities (15,653) (12,408)
Cash flows from financing activities:    
Borrowings under line of credit 83,000 71,000
Repayments on line of credit (51,000) (38,000)
Proceeds from stock options exercised 0 991
Treasury stock purchased (11,297) (44,217)
Net cash provided by (used for) financing activities 20,703 (10,226)
Effect of foreign currency exchange rates on cash and cash equivalents (4,285) 1,390
Net increase (decrease) in cash and cash equivalents 868 1,672
Cash and cash equivalents at beginning of period 60,813 57,153
Cash and cash equivalents at end of period 61,681 58,825
Supplemental cash flow information:    
Income taxes paid 5,034 8,235
Interest paid $ 1,204 $ 375