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Note 2 - Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)
Number of Operating Segments			1
Government Assistance, Amount \| $	$ 0	$ 400	$ 0	$ 900
Operating Lease, Weighted Average Remaining Lease Term (Year)	7 months 6 days		7 months 6 days
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	6 months		6 months
Building [Member]
Property, Plant and Equipment, Useful Life (Year)	39 years		39 years
Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years		10 years
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)			4 years
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) \| shares			57,143