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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Goodwill, Impairment Loss	$ 0
Impairment of Long-Lived Assets Held-for-use	$ 0
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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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