Note 8 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Notes Tables

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

	Fair Value Measurements Using
September 30, 2015	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	$	70,781	$	70,781		-		-
Restricted cash and cash equivalents		12,125		12,125		-		-
Marketable equity securities		110,567		110,567		-		-
Corporate debt securities		69,052		42,550		26,502		-
Commercial mortgage–backed securities		62,735		-		62,735		-
U.S. Treasury securities		20,107		20,107		-		-
State and municipal securities		16,930		7,574		9,356		-
Total financial assets	$	362,297	$	263,704	$	98,593		-

	Fair Value Measurements Using
December 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	$	69,767	$	69,767		-		-
Restricted cash and cash equivalents		10,651		10,651		-		-
Marketable equity securities		132,535		132,535		-		-
Corporate debt securities		68,916		39,909		29,007		-
Commercial mortgage–backed securities		63,252		-		63,252		-
U.S. Treasury securities		14,728		14,728		-		-
State and municipal securities		11,377		2,216		9,161		-
Total financial assets	$	371,226	$	269,806	$	101,420		-