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Note 14 - Fair Value Measurement (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Fair Value as of March 31, 2020
(in thousands)   Level 1   Level 2   Level 3   Total
Assets (Liabilities):                
Interest rate swap agreements   $
-
     $
(747
 )   $
-
     $
(747
 )
    Fair Value as of December 31, 2019
(in thousands)   Level 1   Level 2   Level 3   Total
Assets (Liabilities):                                
Interest rate swap agreements   $
-
     $
(603
 )   $
-
     $
(603
 )