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Note 7 - Investments in Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
September 30, 2015
   
December 31, 2014
 
(in thousands)
 
Amortized
Cost
   
Fair
Value
   
Amortized
Cost
   
Fair
Value
 
Investments available for sale:
                               
Marketable equity securities
  $ 30,176     $ 110,567     $ 30,176     $ 132,535  
Restricted investments available for sale:
                         
Corporate debt securities
    69,347       69,052       68,594       68,916  
Commercial mortgageā€“backed securities
    62,689       62,735       63,351       63,252  
U.S. Treasury securities
    19,939       20,107       14,623       14,728  
State and municipal securities
    16,508       16,930       11,074       11,377  
    $ 198,659     $ 279,391     $ 187,818     $ 290,808  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
September 30, 2015
   
December 31, 2014
 
   
Shares
   
Cost
   
Fair
Value
   
Shares
   
Cost
   
Fair
Value
 
NHI Common Stock
    1,630,642     $ 24,734     $ 93,746       1,630,642     $ 24,734     $ 114,080  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
September 30, 2015
   
December 31, 2014
 
(in thousands)
 
Cost
   
Fair Value
   
Cost
   
Fair
Value
 
Maturities:
                               
Within 1 year
  $ 16,840     $ 16,882     $ 11,161     $ 11,190  
1 to 5 years
    79,240       79,940       83,542       84,028  
6 to 10 years
    69,815       69,409       58,863       58,872  
Over 10 years
    2,588       2,593       4,076       4,183  
    $ 168,483     $ 168,824     $ 157,642     $ 158,273