Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Cash and Cash Equivalents [Table Text Block]

	September 30,		September 30,
	2022		2021
Cash	$	23,856	$	35,161
Cash equivalents		226		—
Restricted cash and cash equivalents included in current assets		—		891
Restricted cash included in long-term assets		—		270
Total cash, cash equivalents, and restricted cash and cash equivalents shown in the Condensed Consolidated Statements of Cash Flows	$	24,082	$	36,322

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

Held-to-maturity debt securities:
Amortized cost	$	9,808
Gross unrecognized gains		—
Gross unrecognized losses		(161	)
Fair value	$	9,647

Investments Classified by Contractual Maturity Date [Table Text Block]

	Amortized Cost		Fair Value
Within one year	$	2,469	$	2,460
After one year through two years		3,937		3,866
After two years through three years		3,402		3,321
Total	$	9,808	$	9,647