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Note 10 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
   
Total
 
March 31, 2019
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
  $
    $
5,490
    $
    $
5,490
 
Municipal bonds
   
     
3,633
     
     
3,633
 
Total
  $
    $
9,123
    $
    $
9,123
 
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
  $
    $
2,881
    $
    $
2,881
 
Municipal bonds
   
     
1,834
     
     
1,834
 
Total
  $
    $
4,715
    $
    $
4,715