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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income (loss) $ 1,354 $ (4,901) [1]  
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization 1,105 1,021  
Operating lease asset amortization 3,202 3,193  
Impairment of goodwill and long-lived assets 0 1,078 $ 0
Loss (gain) on disposal of assets (8) 59  
Stock-based compensation 797 887  
Deferred income taxes 83 442  
Exchange (gain) loss 23 (5)  
Changes in operating assets and liabilities:      
Accounts receivable-trade (325) 86  
Inventory (2,777) (12,686)  
Prepaid expenses 83 675  
Other current assets (8) 1,574  
Accounts payable-trade 1,143 (440)  
Accrued expenses and other liabilities 743 1,022  
Income taxes, net 1,775 (1,120)  
Other assets (52) (41)  
Operating lease liabilities (3,422) (3,371)  
Total adjustments 2,362 (7,626)  
Net cash provided by (used in) operating activities 3,716 (12,527)  
Cash flows from investing activities:      
Purchase of property and equipment (1,001) (1,313)  
Proceeds from sales of short-term investments 0 7,523  
Proceeds from sales of assets 0 46  
Net cash provided by (used in) investing activities (1,001) 6,256  
Cash flows from financing activities:      
Proceeds from long-term debt 0 416  
Payments of capital lease obligations (14) 0  
Repurchase of common stock (2,738) 0  
Purchase of vested stock for employee payroll tax (25) 0  
Net cash provided by (used in) financing activities (2,777) 416  
Effect of exchange rate changes on cash and cash equivalents (112) 279  
Net decrease in cash and cash equivalents (174) (5,576)  
Cash and cash equivalents, beginning of period 10,329 15,905  
Cash and cash equivalents, end of period 10,155 10,329 $ 15,905
Supplemental disclosures of cash flow information:      
Interest paid during the period 16 17  
Income tax paid (refunded) during the period, net (994) 56  
Supplemental disclosures of non-cash activity:      
Change in accruals related to property and equipment 0 (105)  
Operating lease assets obtained in exchange for lease liabilities, net $ 1,853 $ 1,702  
[1] For the year ended December 31, 2020, there were 6,401 shares excluded from the diluted EPS calculation because the impact of their assumed vesting would be anti-dilutive due to a net loss in that period.