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Note 9 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   
March 31, 2021
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Liabilities measured on a recurring basis:
     
 
     
 
     
 
     
 
Interest rate swap
  $
    $
118
    $
    $
118
 
Total liabilities at fair value
  $
    $
118
    $
    $
118
 
   
December 31, 2020
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Liabilities measured on a recurring basis:
     
 
     
 
     
 
     
 
Interest rate swap
  $
    $
148
    $
    $
148
 
Total liabilities at fair value
  $
    $
148
    $
    $
148