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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 260 $ 243
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 192 214
Unrealized and realized (gains) on marketable securities (562) 0
Stock-based compensation expense 15 20
(Gain) on forgiveness of PPP loan 0 (186)
Adjustment to reconcile operating lease expense to cash paid (6) (13)
Loss on disposal of property and equipment 0 14
Deferred taxes 0 (6)
Changes in operating assets and liabilities:    
Accounts receivable 121 7
Inventories (318) 64
Prepaid expenses and other assets (36) 62
Accounts payable 33 (12)
Accrued liabilities (154) 100
Accrued income taxes 70 132
Net cash provided by (used in) operating activities (385) 639
Cash flows from investing activities:    
Purchases of marketable securities (6,027) 0
Proceeds from sales of marketable securities 15 0
Purchases of property, plant and equipment (9) (142)
Net cash used in investing activities (6,021) (142)
Cash flows from financing activities:    
Payment of dividends on preferred stock (300) 0
Net cash used in financing activities (300) 0
Effect of exchange rate changes on cash, cash equivalents and restricted cash (187) 25
Net increase (decrease) in cash, cash equivalents and restricted cash (6,893) 522
Cash, cash equivalents and restricted cash, beginning of period 10,782 6,125
Cash, cash equivalents and restricted cash, end of period 3,889 6,647
Reconciliation of cash, cash equivalents and restricted cash, end of period:    
Cash and cash equivalents, end of period 3,889 6,642
Restricted cash, end of period 0 5
Cash, cash equivalents and restricted cash, end of period 3,889 6,647
Supplemental disclosure of cash flow information:    
Income taxes paid (refunded), net 167 (14)
Interest paid 0 0
Supplemental disclosure of non-cash investing and financing activities:    
Lease liabilities arising from obtaining right-of-use assets $ 178 $ 50