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Note 9 - Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Noncapital losses | $ 112 | $ 60
Research and other credits | 3,360 | 3,020
Stock based compensation | 3,235 | 4,036
Share issue costs | 425 | 610
Accrued liabilities | 227 | 194
Foreign Exchange | 206 | 950
Total deferred tax assets | 7,565 | 8,870
Less: Valuation allowance | (6,474) | (7,585)
Total deferred tax asset including valuation allowance | 1,091 | 1,285
Deferred tax liabilities: |  |
Depreciation | 824 | 592
Prepaid assets | 69 | 52
Uncollectible debts | 1,057 | 0
Foreign exchange | 14 | 108
Total deferred tax liabilities | 1,964 | 752
Net deferred taxliabilities | $ (873) |
Net deferred tax asset |  | $ 533

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