Quarterly report pursuant to Section 13 or 15(d)

Note 16 - Subsequent Events (Details Textual)

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Note 16 - Subsequent Events (Details Textual) - USD ($)
$ in Millions
Apr. 12, 2022
Apr. 10, 2022
Apr. 07, 2022
Mar. 31, 2022
Dec. 31, 2021
Subsequent Event [Member] | Conversion of Series E Preferred Stock to Series F Preferred Stock and Series G Preferred Stock [Member]          
Conversion of Stock, Shares Converted (in shares) 50,000        
Percentage of Outstanding Preferred Stock 100.00%        
Subsequent Event [Member] | Conversion of Series E Preferred Stock to Series F Preferred Stock and Series G Preferred Stock [Member] | Series F Preferred Stock [Member]          
Conversion of Stock, Shares Issued (in shares) 1,740        
Subsequent Event [Member] | Conversion of Series E Preferred Stock to Series F Preferred Stock and Series G Preferred Stock [Member] | Series G Preferred Stock [Member]          
Conversion of Stock, Shares Issued (in shares) 3,260        
Subsequent Event [Member] | Vice Chairman of Board of Directors [Member]          
Percentage of Common Stock, Cap 33.33%        
Subsequent Event [Member] | Purchase Agreement [Member] | Vice Chairman of Board of Directors [Member]          
Debt Instrument, Face Amount   $ 2.5      
Proceeds from Issuance of Long-Term Debt, Total $ 1.5        
Debt Instrument, Interest Rate, Stated Percentage   8.00%      
Preferred Stock Purchase Rights Agreement [Member] | Subsequent Event [Member]          
Non-taxable Dividend, Preferred Share Purchase Right Per Outstanding Common Stock (in shares)     1    
Minimum Percentage of Common Stock     4.99%    
Additional Percentage of Common Stock Acquired     0.50%    
Percentage of Discount Entitled in Purchasing Common Stock     50.00%    
Class of Right, Common Stock Shares Converted (in shares)     5    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]          
Operating Loss Carryforwards, Total       $ 164.1 $ 164.0