Note 10 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

	Fair Value Measurements Using
December 31, 2024	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	$	76,121	$	76,121	$	–	$	–
Restricted cash and cash equivalents		20,801		20,801		–		–
Marketable equity securities		163,254		163,254		–		–
Corporate debt securities		57,471		43,656		13,815		–
Asset–backed securities		14,410		−		14,410		–
U.S. Treasury securities		44,186		44,186		–		–
State and municipal securities		3,737		806		2,931		–
Total financial assets	$	379,980	$	348,824	$	31,156

	Fair Value Measurements Using
December 31, 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	$	107,076	$	107,076	$	–	$	–
Restricted cash and cash equivalents		18,892		18,892		–		–
Marketable equity securities		137,896		137,896		–		–
Corporate debt securities		60,171		42,860		17,311		–
Asset–backed securities		17,659		–		17,210		449
U.S. Treasury securities		45,850		45,850		–		–
State and municipal securities		4,047		–		4,047		–
Total financial assets	$	391,591	$	352,574	$	38,568	$	449