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Note 3 - Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Aug. 31, 2021
Mar. 31, 2022
Aug. 18, 2021
Mar. 31, 2022
Jun. 30, 2021
May 18, 2021
May 09, 2019
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    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   18,637,929   18,637,929 19,351,935    
Stock Repurchase Program, Authorized Amount           $ 6.0 $ 4.0
Stock Repurchase Program, Period in Force (Month)     24 months        
Stock Repurchase Program, Increase in Authorized Amount $ 10.0            
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 6,838,434.0   $ 6,838,434.0      
Blank Check [Member]              
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      
Series B Preferred Stock [Member]              
Preferred Stock, Shares Authorized (in shares)   700,000   700,000 700,000    
Preferred Stock, Shares, Number (in shares)       700,000      
Preferred Stock, Shares Issued, Total (in shares)   625,375   625,375 625,375    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   625,375   625,375 625,375    
Series B-1 Preferred Stock [Member]              
Preferred Stock, Shares Authorized (in shares)   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)   $ 10.70   $ 10.70      
Preferred Stock, Shares Issued, Total (in shares)   212,402   212,402 212,402    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   212,402   212,402 212,402    
Share-Based Payment Arrangement, Nonemployee [Member]              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 4.9   $ 4.9      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 11 months 23 days          
Share-Based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units (RSUs) [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)   910,858   910,858      
Share-Based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units (RSUs) [Member] | Vested and Unissued [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)   16,148   16,148