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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Goodwill, Impairment Loss | $ 0
Impairment of Long-Lived Assets Held-for-use | $ 0
Minimum [Member] |
Customer Payments Term (Day) | 0 days
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 1 year
Maximum [Member] |
Customer Payments Term (Day) | 60 days
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 4 years

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