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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

)