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Note 6 - Preferred Stock (Details Textual)
 3 Months Ended 12 Months Ended
Jun. 30, 2021
$ / shares
shares
Dec. 31, 2011
shares
Dec. 31, 2020
$ / shares
shares
Preferred Stock, Shares Authorized (in shares) 2,445,598   2,445,598
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.01   $ 0.01
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 0   0
Series A Preferred Stock Converted into Common Stock [Member]      
Conversion of Stock, Shares Converted (in shares)   554,402  
Series A Preferred Stock [Member]      
Preferred Stock, Shares Authorized (in shares) 3,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.01    
Preferred Stock, Dividend Rate, Percentage 10.00%    
Preferred Stock, Convertible, Conversion Ratio 1    
Preferred Stock Number Of Authorized Shares Remaining (in shares) 2,445,598    
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 0