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Note 5 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
 
 
 
  
Weighted
  
   
 
 
 
  
Average
  
   
 
 
 
  
Exercise
  
   
Shares
    
Price
  
Outstanding at January 1, 2019
    
18,000
     $
13.22
  
Granted    
—
      
—
  
Exercised
    
—
      
—
  
Expired and forfeited    
—
      
—
  
Outstanding at March 31, 2019    
18,000
     $
13.22
  
Exercisable at March 31, 2019
    
12,247
     $
15.09