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Note 5 - Lease Obligations and Other Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
2018   $
1,169
 
2019    
1,154
 
2020    
862
 
2021    
479
 
2022    
490
 
Thereafter    
1,999
 
Total minimum payments   $
6,153