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Note 10 - Stock Options and Stock Purchase Warrants (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
    Number
of Shares		   Weighted
Average
Exercise
Price
Outstanding, January 1, 2018    
460,000
     $
7.34
  
Granted    
-
      
-
  
Exercised    
-
      
-
  
Forfeited or expired    
-
      
-
  
Outstanding, December 31, 2019    
460,000
     $
7.34
  
Granted    
-
      
-
  
Exercised    
-
      
-
  
Forfeited or expired    
(400,000
 )    
(7.40
 )
Outstanding, December 31, 2020    
60,000
     $
6.93