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Note 9 - Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
   
Payment due by period
  
   
Total
    
< 1 year
    
1 – 3 years
    
3 – 5
years
    
> 5 years
  
Contractual Obligations:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Rent obligations
   $
554,000
     $
78,000
     $
217,000
     $
230,000
     $
29,000
  
                                         
Total
   $
554,000
     $
78,000
     $
217,000
     $
230,000
     $
29,000