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Note 14 - Capital Stock (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
May 22, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Stock Issued During Period, Shares, New Issues (in shares)     1,260,042 2,245,229
Proceeds from Issuance of Private Placement $ 150,008,000 $ 150,008    
Private Placement [Member]        
Stock Issued During Period, Shares, New Issues (in shares) 1,797,359      
Sale of Stock, Price Per Share (in dollars per share) $ 83.46