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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)
Proceeds from Insurance Settlement, Operating Activities			$ 0
Government Assistance, Amount	$ 900	$ 3,900
Number of Operating Segments	1
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 months 24 days
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	3 months 18 days
Building [Member]
Property, Plant and Equipment, Useful Life (Year)	39 years
Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Share-Based Payment Arrangement, Option [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Payment Arrangement, Option [Member] \| Maximum [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	57,143