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Note 3 - Equity (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended 77 Months Ended
May 10, 2022
Aug. 31, 2021
May 18, 2021
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
 [1]
Dec. 31, 2024
Sep. 30, 2024
 [1]
Sep. 30, 2025
Sep. 30, 2025
Aug. 29, 2023
Mar. 31, 2023
May 08, 2021
May 09, 2019
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount       $ 4,500,000         $ 4,500,000 $ 4,500,000        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       3 years                    
Warrants and Rights Outstanding, Term (Year)                       3 years    
Preferred Stock, Shares Authorized (in shares)       30,000,000 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 Amount       $ 6,117,960         $ 6,117,960 $ 6,117,960 $ 8,964,214      
Preferred Stock, Redemption, Number of Shares Redeemed (in shares)                 571,772          
Preferred Stock, Remaining Redemption Amount       2,846,254         $ 2,846,254 2,846,254        
Stock Repurchase Program, Authorized Amount   $ 12,000,000   $ 21,000,000         21,000,000 $ 21,000,000     $ 8,000,000 $ 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)       8,715 [1] 4,607 [1] 0 4,074 [1] 0   2,140,099        
Shares Acquired, Average Cost Per Share (in dollars per share)       $ 17.21 [1] $ 21.71 [1] $ 0 $ 24.55 [1] $ 0   $ 6.24        
Share Repurchase Program, Remaining Authorized, Amount       $ 7,642,188         $ 7,642,188 $ 7,642,188        
Blank Check [Member]                            
Preferred Stock, Shares Authorized (in shares)             30,000,000              
Preferred Stock, Par or Stated Value Per Share (in dollars per share)             $ 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 [1] $ 10.7 $ 10.7 [1] $ 10.7 $ 10.7 $ 10.7 $ 10.7      
Preferred Stock, Redemption, Number of Shares Redeemed (in shares)       70,093                    
Preferred Stock, Shares Issued (in shares)       266,005 336,098       266,005 266,005        
Preferred Stock, Shares Outstanding (in shares)       266,005 336,098       266,005 266,005        
Series B-1 Preferred Stock [Member]                            
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)       $ 10.7     $ 10.7   $ 10.7 $ 10.7 $ 10.7      
Preferred Stock, Shares Issued (in shares)       0         0 0        
Preferred Stock, Shares Outstanding (in shares)       0         0 0        
Restricted Stock Units (RSUs) [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares)       770         770 770        
[1] We close our books and records on the last calendar day of each month to align our financial closing with our business processes.