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Note 10 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value Measurements Using
 
September 30, 2018
 
Fair
Value
   
Quoted Prices in
Active Markets
For Identical
Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable
Inputs
(Level 3)
 
Cash and cash equivalents
  $
55,599
    $
55,599
    $
    $  
Restricted cash and cash equivalents
   
12,134
     
12,134
     
       
Marketable equity securities
   
139,502
     
139,502
     
       
Corporate debt securities
   
66,190
     
43,901
     
22,289
       
Mortgage–backed securities
   
56,293
     
     
56,293
       
U.S. Treasury securities
   
22,540
     
22,540
     
       
State and municipal securities
   
23,011
     
     
23,011
       
Total financial assets
  $
375,269
    $
273,676
    $
101,593
    $  
   
Fair Value Measurements Using
 
December 31, 2017
 
Fair
Value
   
Quoted Prices in
Active Markets
For Identical
Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Unobservable
Inputs
(Level 3)
 
Cash and cash equivalents
  $
59,118
    $
59,118
    $
    $  
Restricted cash and cash equivalents
   
8,303
     
8,303
     
       
Marketable equity securities
   
139,085
     
139,085
     
       
Corporate debt securities
   
65,461
     
43,073
     
22,388
       
Mortgage-backed securities
   
53,544
     
     
53,544
       
U.S. Treasury securities
   
21,172
     
21,172
     
       
State and municipal securities
   
26,218
     
     
26,218
       
Total financial assets
  $
372,901
    $
270,751
    $
102,150
    $