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Note 17 - Convertible Redeemable Preferred Stock (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests, Ending Balance   $ 1,532,164
Series B Preferred Stock [Member]      
Stock Issued During Period, Shares, New Issues (in shares) 170,000    
Proceeds from Issuance of Preferred Stock and Preference Stock $ 1,500,000 $ 1,500,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 10    
Preferred Stock, Convertible, Conversion Price (in dollars per share) $ 1    
Preferred Stock, Dividend Rate, Percentage 8.00%    
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests, Ending Balance $ 1,500,000    
Preferred Stock, Convertible, Beneficial Conversion Feature $ 1,500,000