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Note 17 - Common Stock (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2023
Aug. 31, 2023
Jun. 30, 2023
May 31, 2023
Nov. 30, 2022
Aug. 31, 2022
May 31, 2022
Jun. 30, 2021
Feb. 28, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2020
Common Stock, Shares Authorized (in shares)                   200,000,000 200,000,000   200,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)                   $ 0.03 $ 0.03   $ 0.03
Proceeds from Issuance of Common Stock                   $ 0 $ 0 $ 743,553  
Conversion of Stock, Amount Issued                   0 0 $ 6,365,264  
Stock Repurchased and Retired During Period, Value                   $ 3,145,435 $ 5,026,746    
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5     $ 2 $ 1.5    
Dividends, Common Stock, Total                   $ 14,021,226 $ 10,871,254    
Share Repurchase Program [Member]                          
Stock Repurchase Program, Authorized Amount             $ 20,000,000            
Stock Repurchased and Retired During Period, Shares (in shares)                   162,375 238,335    
Stock Repurchased and Retired During Period, Value                   $ 3,150,000 $ 5,030,000.00    
Directors, Officers, and Employees [Member]                          
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)                   60,500 60,000 49,650  
Conversion of Series B Preferred Stock to Common Stock [Member]                          
Conversion of Stock, Shares Converted (in shares)               6,365          
Conversion of Stock, Shares Issued (in shares)               453,044          
Conversion of Stock, Amount Issued               $ 6,365,000          
ATM Common Stock Offering [Member]                          
Stock Issued During Period, Shares, New Issues (in shares)                 82,901        
Proceeds from Issuance of Common Stock                 $ 740,000