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Note 8 - Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
As of
December 31,
 
   
2018
   
2017
 
                                                 
(In thousands)
 
Principal
   
Deferred Financing
Costs, net
   
Balance
   
Principal
   
Deferred Financing
Costs, net
   
Balance
 
Note payable
  $
2,525
    $
-
    $
2,525
    $
2,525
    $
-
    $
2,525
 
Credit Facility
   
199,000
     
(11,436
)    
187,564
     
170,625
     
(7,214
)    
163,411
 
Total long-term debt
   
201,525
     
(11,436
)    
190,089
     
173,150
     
(7,214
)    
165,936
 
Less current portion
   
(2,000
)    
-
     
(2,000
)    
(1,750
)    
-
     
(1,750
)
Total long-term debt, non-current
  $
199,525
    $
(11,436
)   $
188,089
    $
171,400
    $
(7,214
)   $
164,186
 
Schedule of Maturities of Long-term Debt [Table Text Block]
Year
 
Amount
 
   
(In thousands)
 
2019
  $
2,000
 
2020
   
4,525
 
2021
   
2,000
 
2022
   
2,000
 
2023
   
2,000
 
Thereafter
   
189,000
 
    $
201,525