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Note 15 - Derivatives (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
        December 31, 2019
        Notional Amount   Fair Value (a)
Derivatives instruments  
Balance sheet classification
  
(in thousands)
Interest rate swaps  
Other long term liabilities
   $
28,821
     $
(603
)
        December 31, 2018
        Notional Amount   Fair Value (a)
Derivatives instruments  
Balance sheet classification
  
(in thousands)
  
Interest rate swaps  
Other long term liabilities
   $
34,090
     $
(170
 )
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Derivatives in Hedging Relationships   Amount of gain (loss) recognized in OCI on derivative
(effective portion)
    Year Ended December 31,
    2019   2018
    (in thousands)
Interest rate swaps   $
(572
 )   $
(343
 )
Details about AOCI Components   Amount reclassified from AOCI into income
(effective portion)		    
    Year Ended December 31,   Location of amount reclassified
    2019   2018   into income (effective portion)
      (in thousands)      
Interest rate swaps   $
139
     $
136
    
Interest expense