Note 9 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

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

	Fair Value Measurements Using
March 31, 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	$	84,137	$	84,137	–		–
Restricted cash and cash equivalents		17,163		17,163	–		–
Marketable equity securities		113,461		113,461	–		–
Corporate debt securities		66,122	–			66,122	–
Commercial mortgage–backed securities		53,253	–			53,253	–
U.S. Treasury securities		12,326		12,326	–		–
State and municipal securities		8,377	–			8,377	–
Total financial assets	$	354,839	$	227,087	$	127,752	–

	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	–