Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

	June 30,		June 30,
	2023		2022
Cash	$	12,354	$	23,298
Cash equivalents		2,780		8,010
Restricted cash and cash equivalents included in current assets		—		1,990
Total cash, cash equivalents, and restricted cash and cash equivalents shown in the Condensed Consolidated Statements of Cash Flows	$	15,134	$	33,298

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

	As of
Held-to-maturity debt securities:	June 30, 2023			December 31, 2022
Amortized cost	$	17,729		$	9,341
Gross unrecognized gains		—			—
Gross unrecognized losses		(225	)		(168	)
Fair value	$	17,504		$	9,173

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Within one year	$	12,855	$	12,751
After one year through two years		4,408		4,300
After two years through three years		466		453
Total	$	17,729	$	17,504

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 June 30, 2023	$	110