Note 9 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

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

	Fair Value Measurements Using
June 30, 2014	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	$	75,758	$	75,758	–		–
Restricted cash and cash equivalents		15,187		15,187	–		–
Marketable equity securities		117,618		117,618	–		–
Corporate debt securities		66,761	–			66,761	–
Commercial mortgage–backed securities		54,267	–			54,267	–
U.S. Treasury securities		13,905		13,905	–		–
State and municipal securities		12,285	–			12,285	–
Total financial assets	$	355,781	$	222,468	$	133,313	–

	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	–