Note 9 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

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

	Fair Value Measurements Using
December 31, 2013	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	$	81,705	$	81,705	$	–	$	–
Restricted cash and cash equivalents		13,929		13,929	–		–
Marketable equity securities		105,009		105,009	–		–
Corporate debt securities		65,006	–			65,006	–
Commercial mortgage-backed securities		45,856	–			45,856	–
U.S. Treasury securities		22,841		22,841	–		–
State and municipal securities		8,300	–			8,300	–
Total financial assets	$	342,646	$	223,484	$	119,162	$	–

	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	$	–