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Note 9 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
   
Total
 
June 30
, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
  $
-
    $
4,795
    $
-
    $
4,795
 
Municipal bonds
   
-
     
4,448
     
-
     
4,448
 
Total
  $
-
    $
9,243
    $
-
    $
9,243
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
  $
-
    $
8,428
    $
-
    $
8,428
 
Municipal bonds
   
-
     
4,610
     
-
     
4,610
 
Total
  $
-
    $
13,038
    $
-
    $
13,038