Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

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

	As of
Held-to-maturity debt securities:	March 31, 2025			December 31, 2024
Amortized cost	$	19,349		$	21,059
Gross unrecognized gains		59			50
Gross unrecognized losses		(12	)		(33	)
Fair value	$	19,396		$	21,076

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Within one year	$	9,968	$	9,984
After one year through two years		8,400		8,423
After two years through three years		981		989
Total	$	19,349	$	19,396

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		—
At March 31, 2025	$	106