Note 11 - Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

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

	Fair Value Measurements Using
September 30, 2023	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	$	100,308	$	100,308	$	–	$	–
Restricted cash and cash equivalents		19,947		19,947		–		–
Marketable equity securities		125,820		125,820		–		–
Corporate debt securities		58,180		34,905		23,275		–
Mortgage–backed securities		18,572		–		18,572		–
U.S. Treasury securities		46,198		46,198		–		–
State and municipal securities		3,961		1,288		2,673		–
Total financial assets	$	372,986	$	328,466	$	44,520	$	–

	Fair Value Measurements Using
December 31, 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	$	58,667	$	58,667	$	–	$	–
Restricted cash and cash equivalents		16,198		16,198		–		–
Marketable equity securities		123,144		123,144		–		–
Corporate debt securities		64,894		48,525		16,369		–
Asset–backed securities		22,931		–		22,931		–
U.S. Treasury securities		50,051		50,051		–		–
State and municipal securities		4,771		1,337		3,434		–
Total financial assets	$	340,656	$	297,922	$	42,734	$	–