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Note 3 - Equity (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 58 Months Ended 147 Months Ended
May 10, 2022
Aug. 31, 2021
May 18, 2021
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2023
Mar. 31, 2024
Mar. 31, 2024
Aug. 29, 2023
Jun. 30, 2023
May 09, 2019
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount       $ 4,600,000       $ 4,600,000 $ 4,600,000      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       3 years                
Preferred Stock, Shares Authorized (in shares)         30,000,000   30,000,000       30,000,000  
Preferred Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.01       $ 0.01 $ 0.01   $ 0.01  
Preferred Stock, Redemption Price Per Share (in dollars per share)       $ 10.7       $ 10.7 $ 10.7 $ 10.7    
Preferred Stock, Redemption, Aggerate Purchase Price                   $ 8,964,214    
Preferred Stock, Redemption, Number of Shares Redeemed (in shares)       140,186         140,186      
Preferred Stock Redemption, Redeemed Amount                 $ 1,499,990      
Stock Repurchase Program, Authorized Amount   $ 12,000,000 $ 8,000,000 $ 21,000,000,000,000       $ 21,000,000,000,000 21,000,000,000,000     $ 4,000,000
Stock Repurchase Program, Increase in Authorized Amount $ 9,000,000 $ 4,000,000 $ 4,000,000                  
Stock Repurchased During Period, Shares (in shares)       0 22,012 [1] 155,025 [1]   2,122,703        
Shares Acquired, Average Cost Per Share       $ 0 $ 8.79 [1] $ 8.53 [1]   $ 6.13        
Share Repurchase Program, Remaining Authorized, Amount       $ 7,992,206       $ 7,992,206 $ 7,992,206      
Blank Check [Member]                        
Preferred Stock, Shares Authorized (in shares)       30,000,000       30,000,000 30,000,000      
Preferred Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.01       $ 0.01 $ 0.01      
Series B Preferred Stock [Member]                        
Preferred Stock, Shares Authorized (in shares)       700,000       700,000 700,000   700,000  
Preferred Stock, Shares, Number (in shares)       700,000                
Preferred Stock, Redemption Price Per Share (in dollars per share)       $ 10.7       $ 10.7 $ 10.7      
Preferred Stock, Redemption, Aggerate Purchase Price       $ 6,691,513 $ 6,691,513   $ 6,691,513 $ 6,691,513 $ 6,691,513      
Preferred Stock, Shares Issued (in shares)       625,375       625,375 625,375   625,375  
Preferred Stock, Redemption, Number of Shares Redeemed (in shares)             0          
Series B-1 Preferred Stock [Member]                        
Preferred Stock, Shares Authorized (in shares)       550,000       550,000 550,000   550,000  
Preferred Stock, Shares, Number (in shares)       550,000                
Preferred Stock, Cash, Dividend Rate, Percentage       7.00%                
Preferred Stock, Series B Preferred Shares, Dividend Rate, Percentage       9.00%                
Preferred Stock, Redemption Price Per Share (in dollars per share) [2]       $ 10.7 $ 10.7 $ 10.7 $ 10.7 $ 10.7 $ 10.7      
Preferred Stock, Redemption, Aggerate Purchase Price [2]       $ 772,711 $ 1,522,706   $ 1,522,706 $ 772,711 $ 772,711      
Preferred Stock, Shares Issued (in shares)       72,216       72,216 72,216   212,402  
Preferred Stock, Redemption, Number of Shares Redeemed (in shares) [2]       70,093 70,093 0            
Restricted Stock Units (RSUs) [Member] | Vested and Unissued [Member]                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)       0       0 0      
[1] We close our books and records on the last calendar day of each month to align our financial closing with our business processes.
[2] We close our books and records on the last calendar day of each month to align our financial closing with our business processes.