Note 9 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements Using
December 31, 2012	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	$	66,701	$	66,701	$	–	$	–
Restricted cash and cash equivalents		11,563		11,563		–		–
Marketable equity securities		107,250		107,250		–		–
Corporate debt securities		62,876		–		62,876		–
Commercial mortgage-backed securities		48,063		–		48,063		–
U.S. Treasury securities		16,604		16,604		–		–
State and municipal securities		7,664		–		7,664		–
Total financial assets	$	320,721	$	202,118	$	118,603	$	–

	Fair Value Measurements Using
December 31, 2011	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	$	61,008	$	61,008	$	–	$	–
Restricted cash and cash equivalents		50,587		50,587		–		–
Marketable equity securities		85,051		85,051		–		–
Corporate debt securities		34,074		–		34,074		–
Commercial mortgage-backed securities		33,904		–		33,904		–
U.S. Treasury securities		8,070		8,070		–		–
State and municipal securities		7,577		–		7,577		–
Total financial assets	$	280,271	$	204,716	$	75,555	$	–