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Note 8 - Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2018
    
187,750
     $
3.70
    
 
      
 
  
Granted
    
134,000
      
3.36
    
 
      
 
  
Exercised
    
-
      
-
    
 
      
 
  
Cancelled
    
(97,000
 )    
(3.84
 )  
 
      
 
  
Outstanding – December 31, 2018
    
224,750
     $
3.44
    
8.60
     $
52,715
  
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
     $
379,429
  
Exercisable on December 31, 2019
    
107,567
     $
3.44
    
7.69
     $
154,305