Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

	As of
Held-to-maturity debt securities:	March 31, 2024			December 31, 2023
Amortized cost	$	20,751		$	15,800
Gross unrecognized gains		6			—
Gross unrecognized losses		(92	)		(86	)
Fair value	$	20,665		$	15,714

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Within one year	$	11,872	$	11,824
After one year through two years		8,879		8,841
Total	$	20,751	$	20,665

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

At January 1, 2023	$	110
Provision charged to expense		24
(Write-offs) / Recoveries		(23	)
At December 31, 2023	$	111
Provision charged to expense		—
(Write-offs) / Recoveries		—
At March 31, 2024	$	111