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CONDENSED CONSOLIDATED SATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Cash flows from operating activities: |  |
Net income (loss) | $ 142 | $ (43)
Adjustments to reconcile net income (loss) to net cash used in operating activities: |  |
Depreciation and amortization | 67 | 71
Unrealized (gains) on marketable securities | (156) | 0
Stock-based compensation expense | 0 | 5
Gain on forgiveness of PPP loan | 0 | (186)
Operating leases, other | (3) | (5)
Deferred taxes | 0 | (20)
Changes in operating assets and liabilities: |  |
Accounts receivable | (220) | 143
Inventories | 17 | (20)
Prepaid expenses and other assets | 35 | 55
Accounts payable | (4) | 53
Accrued liabilities | (256) | (48)
Accrued income taxes | 11 | (6)
Net cash used in operating activities | (367) | (1)
Cash flows from investing activities: |  |
Purchases of marketable securities | (2,179) | 0
Purchases of property, plant and equipment | (6) | (12)
Net cash used in investing activities | (2,185) | (12)
Cash flows from financing activities: |  |
Payment of dividends on preferred stock | (100) | 0
Net cash used in financing activities | (100) | 0
Effect of exchange rate changes on cash, cash equivalents and restricted cash | 5 | (9)
Net decrease in cash and cash equivalents | (2,647) | (22)
Cash, cash equivalents and restricted cash, beginning of period | 10,782 | 6,125
Cash, cash equivalents and restricted cash, end of period | 8,135 | 6,103
Reconciliation of cash, cash equivalents and restricted cash, end of period: |  |
Cash and cash equivalents, end of period | 8,130 | 6,098
Restricted cash, end of period | 5 | 5
Cash, cash equivalents and restricted cash, end of period | 8,135 | 6,103
Supplemental disclosure of cash flow information: |  |
Income taxes paid | 8 | 6
Interest paid | $ 0 | $ 0

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