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Note 11 - Stock Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Nonvested Share Activity [Table Text Block]
Non-vested Shares     Shares       Weighted-Average Grant-Date Fair Value  
Non-vested on January 1, 2019    
21,948
     
10.16
 
Granted    
15,444
     
5.84
 
Vested    
(14,108
)    
11.01
 
Non-vested on December 31, 2019    
23,284
     
6.77