Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Debt Securities, Held-to-Maturity [Table Text Block]

	As of
Held-to-maturity debt securities:	September 30, 2025			December 31, 2024
Amortized cost	$	20,152		$	21,059
Gross unrecognized gains		66			50
Gross unrecognized losses		(1	)		(33	)
Fair value	$	20,217		$	21,076

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Within one year	$	12,183	$	12,217
After one year through two years		6,985		7,003
After two years through three years		984		997
Total	$	20,152	$	20,217

Financing Receivable, Allowance for Credit Loss [Table Text Block]

At January 1, 2024	$	111
Provision charged to expense		—
(Write-offs) / Recoveries		(5	)
At December 31, 2024	$	106
Provision charged to expense		—
(Write-offs) / Recoveries		2
At September 30, 2025	$	108