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Note 6 - Warrants (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Year Ended
   
Year Ended
 
(In thousands, except exercise price)
 
December 31, 2018
   
December 31, 201
7
 
   
 
 
 
 
Wtd. Avg.
   
 
 
 
 
Wtd. Avg.
 
   
 
 
 
 
Exercise
   
 
 
 
 
Exercise
 
   
Shares
   
Price
   
Shares
   
Price
 
Outstanding at beginning of year
   
6,689
    $
4.50
     
7,603
    $
4.46
 
Exercised
   
(2,609
)
   
4.75
     
(914
)
   
4.18
 
Outstanding and exercisable at end of year
   
4,080
    $
4.35
     
6,689
    $
4.50