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Note 19 - Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Compensation and benefit accruals | $ 386,000 | $ 359,000
Inventory valuation | 877,000 | 866,000
Federal and state net operating loss carryforwards | 33,851,000 | 32,470,000
Deferred revenue | 391,000 | 975,000
Accounts receivable allowance | 7,000 | 8,000
Depreciation | 0 | 85,000
Defined benefit pension plan | 708,000 | 591,000
Lease liabilities | 1,193,000 | 1,334,000
Foreign deferred revenue and other provisions | 3,604,000 | 4,054,000
Other | 718,000 | 661,000
Total | 41,735,000 | 41,403,000
Domestic valuation allowance | (37,015,000) | (36,217,000)
Foreign valuation allowance | 0 | (3,717,000)
Total deferred tax assets | 4,720,000 | 1,469,000
Deferred tax liabilities: |  |
Depreciation | (114,000) | 0
Right-of-use assets, net | (1,002,000) | (1,132,000)
Total deferred tax liabilities | (1,116,000) | (1,132,000)
Net deferred tax asset | $ 3,604,000 | $ 337,000

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