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Note 10 - Stockholders' Equity (Details Textual) - USD ($)
6 Months Ended
May 25, 2021
Mar. 22, 2021
Apr. 26, 2019
Jun. 30, 2022
Apr. 21, 2020
Share Exchange, Value Per Share (in dollars per share)         $ 0.44313
Common Stock Dividends, Shares (in shares) 1,736,501        
Shares Issued, Price Per Share (in dollars per share) $ 0.44313 $ 0.853      
Proceeds from Issuance of Private Placement   $ 3,000,000.0 $ 27,500,000    
Private Placement [Member]          
Stock Issued During Period, Shares, New Issues (in shares)   3,517,000      
Conversion of Series A Preferred Stock to Common Stock [Member]          
Conversion of Stock, Shares Issued (in shares)       748,000  
Conversion of Stock, Shares Converted (in shares)       3,316  
Series A Preferred Stock [Member]          
Dividends, Total $ 1,650,000        
Dividends, Cash, Total $ 880,000