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Note 8 - Stock Incentive Plan (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Nonvested Share Activity [Table Text Block]
Unvested Shares   Shares   Weighted-Average
Grant-Date Fair Value
Unvested on January 1, 2017    
116,280
      
2.08
  
Granted    
-
      
-
  
Vested    
-
      
-
  
Forfeited    
(4,036
 )    
2.78
  
Unvested on June 30, 2017    
112,244
      
2.05