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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Consolidated net loss $ (568) $ (543)
Adjustments to reconcile consolidated net loss to net cash    
Depreciation and amortization 2,054 1,720
Gain on loan forgiveness (580) 0
Stock-based compensation 1,117 700
Deferred income taxes (16) (412)
Pension cost 308 596
Loss on disposal of property and equipment 0 33
Changes in operating assets and liabilities:    
Accounts receivable 431 568
Prepaid expenses and other current assets 342 (297)
Other assets 214 (8)
Accounts payable and accrued expenses 2,895 814
Accrued salaries, wages and related benefits 976 1,729
Income and other taxes (1,531) 753
Net cash provided by operating activities 5,642 5,653
Cash flows from investing activities:    
Capital expenditures (2,919) (1,115)
Proceeds from disposal of property and equipment 0 39
Net cash used in investing activities (2,919) (1,076)
Cash flows from financing activities:    
Proceeds from stock option exercises 2,214 167
Withholding taxes on net settlement of stock-based compensation (763) 0
Payment of long-term obligations (666) (800)
Proceeds from bank loan 0 580
Net cash provided by (used in) financing activities 785 (53)
Effect of exchange rate changes on cash and cash equivalents (138) (62)
Net increase in cash and cash equivalents 3,370 4,462
Cash and cash equivalents, beginning of period 17,573 10,874
Cash and cash equivalents, end of period 20,943 15,336
Supplemental disclosures of cash flow information:    
Shares withheld for withholding taxes on net settlement for stock-based compensation 763 0
Cash paid for income taxes 201 209
Cash paid for operating leases 1,312 1,777
Cash paid for interest $ 18 $ 113