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Note 9 - Stock Incentive Plan (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Nonvested Share Activity [Table Text Block]
             
Unvested Shares   Shares     Weighted-Average Grant-Date Fair Value  
Unvested on January 1, 2020    
23,304
      
6.77
  
Granted    
-
      
-
  
Vested    
(7,729
 )    
8.56
  
Forfeited    
-
      
-
  
Unvested on September 30, 2020    
15,575
      
5.88