Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

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

	As of
Held-to-maturity debt securities:	September 30, 2023			December 31, 2022
Amortized cost	$	19,685		$	9,341
Gross unrecognized gains		—			—
Gross unrecognized losses		(187	)		(168	)
Fair value	$	19,498		$	9,173

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Within one year	$	14,802	$	14,694
After one year through two years		4,883		4,804
Total	$	19,685	$	19,498

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

At January 1, 2022	$	223
Provision charged to expense		(19	)
(Write-offs) / Recoveries		(94	)
At December 31, 2022	$	110
Provision charged to expense		—
(Write-offs) / Recoveries		—
At September 30, 2023	$	110