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Note 9 - Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Shares
    
Weighted-
Average
Exercise Price
Per Share
    
Weighted-
Average
Remaining
Contractual
Term (in years)
    
Aggregate
Intrinsic Value
  
Outstanding – January 1, 2019
    
224,750
     $
3.44
      
 
      
 
  
Granted
    
186,200
      
4.31
      
 
      
 
  
Exercised
    
(2,250
 )    
(3.20
 )    
 
      
 
  
Cancelled
    
(36,500
 )    
(3.66
 )    
 
      
 
  
Outstanding – December 31, 2019
    
372,200
     $
3.85
      
8.57
     $
379
  
Granted
    
42,300
      
4.34
      
 
      
 
  
Exercised
    
(14,133
 )    
(3.78
 )    
 
      
 
  
Cancelled
    
(37,727
 )    
(3.37
 )    
 
      
 
  
Outstanding – December 31, 2020
    
362,640
     $
3.96
      
7.78
     $
1,164
  
Exercisable on December 31, 2020
    
150,840
     $
3.61
      
7.09
     $
537