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Note 11 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 12, 2022	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Prepaid Expense, Current		$ 1,212			$ 1,212		$ 4,248
Mr. McAfee [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)	180,000
Accrued Liabilities, Current		200			200
Various Board Members [Member]
Share-Based Payment Arrangement, Expense		100		$ 100	200	$ 200
Employment Agreements and Expense Reimbursements [Member] \| Mr. McAfee [Member]
Related Party Transaction, Amounts of Transaction					400
Prepayments [Member] \| Mr. McAfee [Member]
Related Party Transaction, Amounts of Transaction					200
Prepaid Expense, Current		$ 100			100
One-time Guarantee Fee [Member] \| Mr. McAfee [Member]
Related Party Transaction, Amounts of Transaction	$ 2,000		$ 400
Board Compensation Fees [Member] \| Various Board Members [Member]
Related Party Transaction, Amounts of Transaction					$ 400		$ 300