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Note 12 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Research and development credit carryforwards | $ 10,743 | $ 16,965
Foreign tax credit carryforwards | 933 | 3,497
Accrued liabilities | 1,655 | 2,019
Deferred revenues | 7,250 | 5,123
Operating lease liabilities | 11,777 | 15,924
Intangible assets | 12,377 | 1,397
Stock-based compensation | 4,085 | 3,907
Other | 2,987 | 720
Gross deferred tax assets | 51,807 | 49,552
Valuation allowance | (11,364) | (11,188)
Net deferred tax assets | 40,443 | 38,364
Fixed assets | (3,320) | (7,017)
Operating leases - right of use asset | (9,010) | (13,054)
Deferred commissions | (3,026) | (2,482)
Total deferred tax liabilities | (15,356) | (22,553)
Net deferred tax assets | $ 25,087 | $ 15,811

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