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Note 8 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
 
Year Ending
 
 
 
 
(In thousands)
December 31
 
 
 
 
           
 
2019
  $
748
 
 
2020
   
764
 
 
2021
   
452
 
 
Total
  $
1,964