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Note 9 - Common and Preferred Stock (Details Textual)
 3 Months Ended 12 Months Ended 21 Months Ended
Jul. 02, 2021
USD ($)
$ / shares
Jul. 01, 2021
USD ($)
$ / shares
shares
Jun. 29, 2021
$ / shares
shares
Mar. 05, 2020
shares
Jan. 31, 2013
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Jul. 02, 2026
$ / shares
Common Stock, Shares Authorized (in shares)           70,000,000   70,000,000 70,000,000  
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares           $ 0.01   $ 0.01 $ 0.01  
Common Stock, Shares, Issued (in shares)           66,541,262   55,823,810 66,541,262  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         400,000          
Percentage Of Projects Annual Capacity         51.00%          
Number of Milestones for Common Stock Issuance         2          
Shares Payable Term From Date Earned (Year)         3 years          
Preferred Stock, Shares Issued, Total (in shares)           329   329 329  
Preferred Stock, Dividend Rate, Percentage           8.875% 8.875%      
Preferred Stock, Shares Authorized (in shares)           100,000   100,000 100,000  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares           $ 0.01   $ 0.01 $ 0.01  
Payments of Dividends | $           $ 1,288,000 $ 1,288,000   $ 7,843,000  
Common Stock, Shares, Outstanding (in shares)           66,541,262   55,823,810 66,541,262  
Preferred Class A [Member]                    
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)       405.05            
Series 1 Preferred Stock [Member]                    
Conversion of Stock, Shares Converted (in shares)               9,671    
Conversion of Stock, Shares Issued (in shares)               3,917,235    
Preferred Stock, Shares Issued, Total (in shares)               329    
Depository Shares [Member]                    
Preferred Stock, Shares Per Depository Share (in dollars per share) | $ / shares     $ 0.001              
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares $ 25.00 $ 25.00                
Preferred Stock, Liquidation Preference Per Share Per Year   2.21875                
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares           $ 0.55     $ 0.55  
Depository Shares [Member] | Sale Including Overallotment Option [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)     2,000,000              
Sale Including Overallotment Option [Member] | Sale Including Overallotment Option [Member] | Maximum [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)     300,000              
Series A Preferred Stock [Member]                    
Preferred Stock, Shares Issued, Total (in shares)           2,300   2,300 2,300  
Preferred Stock, Dividend Rate, Percentage 8.875% 8.875% 8.875%     8.875%   8.875%    
Proceeds From Issuance of Preferred Stock, Net of Issuance Costs | $ $ 54,000,000                  
Preferred Stock, Shares Authorized (in shares)   7,500       7,500   7,500 7,500  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 0.01       $ 0.01   $ 0.01 $ 0.01  
Preferred Stock, Liquidation Preference, Value | $   $ 25,000.00                
Preferred Stock, Liquidation Preference Per Share Per Year   2,218.75                
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares           $ 550.00     $ 550.00  
Conversion of Stock, Shares Cap (in shares)   3,748.13                
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member]                    
Debt Conversion, Converted Instrument, Shares Issued (in shares)       10,000            
Shares Earned Upon The Signing Of Binding Agreements [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         100,000          
Shares Earned Upon The Commencement Of Construction [Member]                    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)         100,000          
Forecast [Member] | Depository Shares [Member]                    
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares                   $ 25.00
Forecast [Member] | Series A Preferred Stock [Member]                    
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares                   $ 25,000.00
Upon Change of Control [Member] | Depository Shares [Member]                    
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares   $ 25.00                
Upon Change of Control [Member] | Series A Preferred Stock [Member]                    
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares   $ 25,000.00