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Note 3 - Equity (Details Textual) - USD ($)
3 Months Ended
Aug. 31, 2021
Dec. 31, 2021
Aug. 18, 2021
Jun. 30, 2021
May 18, 2021
May 09, 2019
Preferred Stock, Shares Authorized (in shares)   30,000,000   30,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.01   $ 0.01    
Stock Repurchase Program, Authorized Amount         $ 6,000,000.0 $ 4,000,000.0
Stock Repurchase Program, Period in Force (Month)     24 months      
Stock Repurchase Program, Increase in Authorized Amount $ 10,000,000          
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 10,579,912        
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   19,154,464   19,351,935    
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    
Preferred Stock, Shares, Number (in shares)   700,000        
Preferred Stock, Shares Issued, Total (in shares)   625,375        
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   625,375   625,375    
Series B-1 Preferred Stock [Member]            
Preferred Stock, Shares Authorized (in shares)   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)   $ 10.70        
Preferred Stock, Shares Issued, Total (in shares)   212,402   212,402    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   212,402   212,402    
Share-based Payment Arrangement, Nonemployee [Member]            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 4,800,000        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 1 month 24 days        
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Nonemployee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)   897,731        
Restricted Stock Units (RSUs) [Member] | Vested and Unissued [Member] | Share-based Payment Arrangement, Nonemployee [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)   8,351