Note 10 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

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

	Fair Value Measurements Using
June 30, 2025	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	$	110,992	$	110,992	$	–	$	–
Restricted cash and cash equivalents		19,370		19,370		–		–
Marketable equity securities		162,905		162,905		–		–
Corporate debt securities		60,888		37,152		23,736		–
Asset–backed securities		13,381		–		13,381		–
U.S. Treasury securities		55,718		55,718		–		–
State and municipal securities		3,714		800		2,914		–
Total financial assets	$	426,968	$	386,937	$	40,031	$	–

	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	$	–