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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net earnings $ 1,769 $ 4,098
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 8,234 8,216
Stock-based compensation 1,220 1,601
Amortization of deferred financing costs 316 232
Deferred income taxes (1,030) (1,002)
Net unrealized gains/losses on foreign currency revaluation 58 123
Gain on sale of property 0 (4,257)
Other, net 105 1,316
Changes in operating assets and liabilities:    
Accounts receivable, net (2,463) 7,734
Unbilled receivables 984 4,329
Inventories 1,906 1,799
Accounts payable 994 (13,350)
Accrued expenses 1,307 (2,052)
Other operating assets/liabilities, net 3,443 (1,032)
Net cash provided by operating activities 16,843 7,755
Cash flows from investing activities:    
Purchases of property, plant and equipment (2,980) (5,329)
Proceeds from disposal/sale of property, plant and equipment 20 5,784
Net cash (used in) provided by investing activities (2,960) 455
Cash flows from financing activities:    
Dividends paid to common stockholders (1,613) (1,600)
Deferred financing costs (600) 0
Borrowings under revolving credit line 0 12,000
Repayments of revolving credit line 0 (12,000)
Repayments of long-term debt (8,179) (1,487)
Net cash used in financing activities (10,392) (3,087)
Effect of exchange rate changes on cash and cash equivalents (492) (639)
Net increase in cash and cash equivalents 2,999 4,484
Cash and cash equivalents - beginning of period 72,289 53,911
Cash and cash equivalents - end of period 75,288 58,395
Supplementary information:    
Income taxes, net of refunds received 1,473 2,805
Interest payments $ 2,339 $ 2,533