Note 4 - Revenue and Segment Information - Contract Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts receivable (including related-party), beginning of year	$ 1,148	$ 126
Accounts receivable (including related-party), end of year	4,300	1,148
Unearned revenue, beginning of year	3,888	4,388
Unearned revenue, end of year	$ 3,243	$ 3,888

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
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-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant