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Note 11 - Share-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   
Number of
Time-Based
Restricted
Stock Units
    
Weighted
Average
Grant Date Fair
Value per Share
  
Outstanding non-vested at December 30, 2017
    
87,034
     $
5.88
  
Granted
    
-
      
-
  
Vested
    
-
      
-
  
Forfeited or expired
    
-
      
-
  
Outstanding non-vested at March 31, 2018
    
87,034
     $
5.88
  
   
Number of
Performance-Based
Restricted
Stock Units
    
Weighted
Average
Grant Date Fair
Value per Share
  
Outstanding non-vested at December 30, 2017
    
400,000
     $
5.11
  
Granted
    
-
      
-
  
Vested
    
-
      
-
  
Forfeited or expired
    
-
      
-
  
Outstanding non-vested at March 31, 2018
    
400,000
     $
5.11