Note 11 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	Fair Value Measurements Using
September 30, 2022	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	$	44,515	$	44,515	$	–	$	–
Restricted cash and cash equivalents		27,685		27,685		–		–
Marketable equity securities		127,996		127,996		–		–
Corporate debt securities		71,185		36,516		34,669		–
Mortgage–backed securities		25,236		–		25,236		–
U.S. Treasury securities		47,306		47,306		–		–
State and municipal securities		4,704		–		4,704		–
Total financial assets	$	348,627	$	284,018	$	64,609	$	–

	Fair Value Measurements Using
December 31, 2021	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	$	107,607	$	107,607	$	–	$	–
Restricted cash and cash equivalents		12,136		12,136		–		–
Marketable equity securities		140,066		140,066		–		–
Corporate debt securities		81,779		50,005		31,774		–
Asset–backed securities		34,770		–		34,770		–
U.S. Treasury securities		47,628		47,628		–		–
State and municipal securities		7,923		–		7,923		–
Total financial assets	$	431,909	$	357,442	$	74,467	$	–