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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities    
Net income (loss) $ 351 $ (2,921)
Depreciation 37 58
Amortization of right-of-use assets 107 64
Amortization of imputed interest (107) (111)
Interest expense from PPP Loan 4  
Non-cash cost of operating leases 130 155
Change in receivable reserves 34 29
Change in inventory reserves 25 (231)
Change in long term payables   (92)
Change in insurance receivable 95 1,449
Loss on investments   1,143
Stock-based compensation 33 2
Foreign currency remeasurement gain   10
Changes in current operating assets and liabilities:    
Accounts receivable (1,480) 276
Inventories (805) 132
Prepaid expenses and other assets (94) (2)
Income taxes (10) (481)
Accounts payable and accrued liabilities 421 (820)
Deferred revenue 1,849 304
Net cash provided by / (used in) operating activities 590 (1,036)
Financing activities    
Bank overdrafts   (205)
Gain on forgiveness of PPP Loan (1,417)  
Principal repayments of financing leases (232) (214)
Net cash used in financing activities (1,649) (419)
Decrease increase in cash and restricted cash (1,059) (1,455)
Cash, and restricted cash, beginning of year 7,567 8,213
Cash, and restricted cash, end of year $ 6,508 $ 6,758