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Note 18 - Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Deferred tax assets: |  |
Compensation and benefit accruals | $ 328,000 | $ 386,000
Inventory valuation | 863,000 | 877,000
Federal and state net operating loss carryforwards | 35,351,000 | 33,851,000
Deferred revenue | 21,000 | 391,000
Accounts receivable allowance | 15,000 | 7,000
Defined benefit pension plan | 621,000 | 708,000
Lease liabilities | 1,037,000 | 1,193,000
Foreign deferred revenue and other provisions | 2,548,000 | 3,604,000
Other | 779,000 | 718,000
Total | 41,563,000 | 41,735,000
Domestic valuation allowance | (37,441,000) | (37,015,000)
Total deferred tax assets | 4,122,000 | 4,720,000
Deferred tax liabilities: |  |
Depreciation | (714,000) | (114,000)
Right-of-use assets, net | (860,000) | (1,002,000)
Total deferred tax liabilities | (1,574,000) | (1,116,000)
Net deferred tax asset | $ 2,548,000 | $ 3,604,000

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