Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Preferred Stock (Details Textual)

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Note 8 - Preferred Stock (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 9 Months Ended 12 Months Ended
Apr. 06, 2021
Apr. 04, 2021
Dec. 20, 2019
Dec. 31, 2020
Feb. 28, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Preferred Stock, Shares Authorized (in shares)       100,000,000   100,000,000   100,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.01   $ 0.01   $ 0.01
Stock Issued During Period, Shares, New Issues (in shares)       745,241 1,871,932      
Preferred Stock, Dividend Rate, Percentage           12.50%   12.50%
Payments for Repurchase of Redeemable Preferred Stock           $ 125,000 $ (0)  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       125   0   125
Series A Preferred Stock [Member]                
Stock Issued During Period, Shares, New Issues (in shares)     125          
Preferred Stock, Dividend Rate, Percentage     12.50%          
Proceeds from Issuance of Redeemable Preferred Stock, Net     $ 60,600          
Stock Redeemed or Called During Period, Shares (in shares) 125 125            
Preferred Stock, Redemption Price Per Share (in dollars per share) $ 1,000 $ 1,000            
Payments for Repurchase of Redeemable Preferred Stock $ 137,416              
Preferred Stock, Shares Outstanding, Ending Balance (in shares)           0