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Note 16 - Stock-based Compensation (Details Textual) - New Employment Agreement [Member]
Feb. 26, 2021
USD ($)
shares
Stock Based Compensation [Line Items]  
Incremental value provided in modification $ 0
Additional compensation expense recognized 0
Stock-based compensation expense $ 2,000,000
Minimum [Member]  
Stock Based Compensation [Line Items]  
Percentage of issued and outstanding shares of common stock owned 4.99%
Executive Chairman And Chief Executive Officer | Restricted Stock Units [Member]  
Stock Based Compensation [Line Items]  
Fully vested shares granted | shares 200,000