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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Net income $ 407 $ 5,301 $ 38,572
Adjustments to reconcile net income to net cash provided by (used for) operating activities:      
Depreciation and amortization 24,033 26,747 29,735
Provision for credit losses (182) 0 332
Deferred income taxes 1,377 (1,560) (478)
Shares issued for employee benefit plan 1,199 1,092 1,136
Employee and director stock-based compensation 10,013 9,969 9,122
Performance-based common stock warrants 0 (686) 686
Impairment of long-term assets 2,888 3,338 134
Loss on sale of Argentina subsidiary, net of cash transferred 0 5,960 0
Accrued social insurance adjustment 0 0 (9,464)
Loss on sale of Ohio call center 0 0 712
Changes in operating assets and liabilities:      
Accounts receivable and contract assets 12,765 2,007 14,884
Inventories (9,913) (14,985) 28,295
Prepaid expenses and other assets (917) (630) (245)
Accounts payable and accrued liabilities (28,670) 870 (33,543)
Accrued income taxes (2,074) 2,860 (6,486)
Net cash provided by (used for) operating activities 10,926 40,283 73,392
Cash flows from investing activities:      
Purchase of term deposit (7,487) 0 0
Redemption of term deposit 7,803 0 0
Acquisition of the net assets of Qterics, Inc. (939) 0 0
Acquisitions of property, plant and equipment (14,006) (12,586) (16,862)
Acquisitions of intangible assets (6,579) (4,455) (6,372)
Payment on sale of Ohio call center 0 0 (500)
Net cash provided by (used for) investing activities (21,208) (17,041) (23,734)
Cash flows from financing activities:      
Borrowings under line of credit 133,000 112,000 75,000
Repayments on line of credit (101,000) (76,000) (123,000)
Proceeds from stock options exercised 1,536 1,638 2,805
Treasury stock purchased (13,035) (59,664) (17,678)
Contingent consideration payments in connection with business combinations 0 0 (3,091)
Net cash provided by (used for) financing activities 20,501 (22,026) (65,964)
Effect of foreign currency exchange rate changes on cash and cash equivalents (4,292) 2,444 (843)
Net increase (decrease) in cash and cash equivalents 5,927 3,660 (17,149)
Cash and cash equivalents at beginning of period 60,813 57,153 74,302
Cash and cash equivalents at end of period 66,740 60,813 57,153
Supplemental cash flow information:      
Income taxes paid 10,922 10,093 12,712
Interest paid $ 2,214 $ 620 $ 1,610