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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Operating activities      
Net income $ 5,095 $ 3,712  
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 10,232 10,059  
Stock-based compensation expense 4,397 5,620  
Deferred taxes (3,213) (69)  
Other 79 126  
Changes in operating assets and liabilities:      
Accounts receivable (6,329) (14,558)  
Inventories (675) 917  
Prepaid expenses and other 1,110 2,696  
Income taxes 4,519 (183)  
Accounts payable (326) 669  
Accrued liabilities and other 2,894 (2,564)  
Net cash provided by operating activities 17,783 6,425  
Investing activities      
Purchases of property, equipment and other capital assets (3,069) (6,546)  
Cash used for acquisitions, net of cash acquired 0 (127,709)  
Purchases of marketable securities (29,366) (8,227)  
Proceeds from sales of marketable securities 0 45,194  
Proceeds from call redemptions and maturities of marketable securities 6,600 7,155  
Net cash used in investing activities (25,835) (90,133)  
Financing activities      
Proceeds from exercises of stock options 6 1,704  
Purchases of shares withheld for tax obligations (468) (1,994)  
Principal repayments of finance lease obligations (139) (137)  
Net cash used in financing activities (601) (427)  
Effect of exchange rate changes on cash and cash equivalents (37) 306  
Net decrease in cash and cash equivalents (8,690) (83,829)  
Cash and cash equivalents, beginning of period 65,929 127,603 $ 127,603
Cash and cash equivalents, end of period $ 57,239 $ 43,774 $ 65,929