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Note 10 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
(In thousands)
 
 
 
 
Year ending December 31,
 
Amount
 
2019
  $
396
 
2020
   
376
 
2021
   
378
 
2022
   
339
 
2023
   
315
 
thereafter
   
1,273
 
         
Total minimum payments required*   $
3,077