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Note 11 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
   
Total
 
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
  $
    $
2,881
    $
    $
2,881
 
Municipal bonds
   
     
1,834
     
     
1,834
 
Total
  $
    $
4,715
    $
    $
4,715
 
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
  $
    $
8,428
    $
    $
8,428
 
Municipal bonds
   
     
4,610
     
     
4,610
 
Total
  $
    $
13,038
    $
    $
13,038