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Note 14 - Commitments (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
         
   
Operating
Leases
 
(in thousands)
       
Years Ending December 31,
 
 
 
 
2019
  $
3,411
 
2020
   
2,612
 
2021
   
2,266
 
2022
   
2,211
 
2023
   
975
 
After 2023
   
2,142
 
Total future minimum lease payments
  $
13,617