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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Cash flows from operating activities:              
Net loss $ (982) [1] $ (1,738) $ (1,719) [1] $ 1,520 $ (4,495) [1] $ (1,074) [1]  
Adjustments to reconcile net loss to net cash provided by operating activities:              
Depreciation and amortization         781 1,387  
Operating lease asset amortization         2,425 2,604  
Impairment of long-lived assets 0   0   1,078 0  
(Gain) loss on disposal of assets         143 (35)  
Stock-based compensation         629 570  
Deferred income taxes         (176) (507)  
Exchange (gain) loss         (1) 134  
Changes in operating assets and liabilities:              
Accounts receivable-trade         15 (123)  
Inventory         (10,757) 9,573  
Prepaid expenses         423 453  
Other current assets         59 (105)  
Accounts payable-trade         1,481 488  
Accrued expenses and other liabilities         244 (1,759)  
Income taxes, net         (1,082) (998)  
Other assets         (2,488) (149)  
Operating lease liabilities         (2,548) (2,538)  
Total adjustments         (9,774) 8,995  
Net cash provided by (used in) operating activities         (14,269) 7,921  
Cash flows from investing activities:              
Purchase of property and equipment         (1,164) (163)  
Purchase of short-term investments         (1,697) (16,393)  
Proceeds from sales of assets         1 84  
Proceeds from sales of short-term investments         10,910 7,395  
Net cash provided by (used in) investing activities         8,050 (9,077)  
Cash flows from financing activities:              
Proceeds from long-term debt         410 0  
Payments on long-term debt         0 (8,968)  
Repurchase of treasury stock         0 (735)  
Net cash provided by (used in) financing activities         410 (9,703)  
Effect of exchange rate changes on cash and cash equivalents         60 135  
Net decrease in cash and cash equivalents         (5,749) (10,724)  
Cash and cash equivalents, beginning of period   $ 15,905   $ 24,070 15,905 24,070 $ 24,070
Cash and cash equivalents, end of period $ 10,156   $ 13,346   $ 10,156 $ 13,346 $ 15,905
[1] For the three and nine months ended September 30, 2020, there were 1,875 and 7,422 shares, respectively, excluded from the diluted EPS calculation and for the three and nine months ended September 30, 2019, there were 2,704 and 5,200 shares, respectively excluded from the diluted EPS calculation because the impact of their assumed vesting would be anti-dilutive due to a net loss in those respective periods.