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Note 12 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Fair Value as of December 31, 2019

 

(in thousands)

 

Level 1

   

Level 2

   

Level 3

   

Total

 

Assets (Liabilities)

                               

Interest rate swap agreements

  $ -     $ (603

)

  $ -     $ (603

)