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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net income $ 78 $ 12,586
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 12,155 13,128
Provision for credit losses (204) 1
Deferred income taxes 1,227 1,637
Shares issued for employee benefit plan 626 681
Employee and director stock-based compensation 5,136 5,044
Performance-based common stock warrants 0 274
Changes in operating assets and liabilities:    
Accounts receivable and contract assets (5,195) (6,241)
Inventories (16,287) (1,076)
Prepaid expenses and other assets 1,329 625
Accounts payable and accrued liabilities (15,001) (7,338)
Accrued income taxes (948) (2,837)
Net cash provided by (used for) operating activities (17,084) 16,484
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 (5,482) (6,206)
Acquisitions of intangible assets (3,019) (1,907)
Net cash provided by (used for) investing activities (16,927) (8,113)
Cash flows from financing activities:    
Borrowings under line of credit 62,000 41,000
Repayments on line of credit (30,000) (15,000)
Proceeds from stock options exercised 0 991
Treasury stock purchased (11,211) (26,684)
Net cash provided by (used for) financing activities 20,789 307
Effect of foreign currency exchange rates on cash and cash equivalents (1,461) 1,859
Net increase (decrease) in cash and cash equivalents (14,683) 10,537
Cash and cash equivalents at beginning of period 60,813 57,153
Cash and cash equivalents at end of period 46,130 67,690
Supplemental cash flow information:    
Income taxes paid 3,466 5,663
Interest paid $ 623 $ 202