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Note 8 - Preferred Stock (Details Textual) - $ / shares
Dec. 14, 1995
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2011
Preferred Stock, Shares Authorized (in shares) 3,000,000 2,445,598 2,445,598  
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)   0 0  
Preferred Stock, Shares Issued, Total (in shares)   0 0  
Series A Preferred Stock [Member]        
Preferred Stock, Shares Authorized (in shares) 3,000,000      
Preferred Stock, Dividend Rate, Percentage 10.00%      
Preferred Stock, Conversion Basis 1      
Common Stock For Conversion (in shares)       554,402
Preferred Stock Number Of Authorized Shares Remaining (in shares)       2,445,598
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   0    
Preferred Stock, Shares Issued, Total (in shares)   0