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Note 12 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Lease, Weighted Average Remaining Lease Term (Year)	3 years 9 months 3 days
Operating Lease, Weighted Average Discount Rate, Percent	6.14%
Operating Lease, Payments	$ 0.2	$ 0.1
General and Administrative Expense [Member]
Operating Lease, Cost	0.1	0.1
Variable Lease, Cost	0.1	0.1
Short-Term Lease, Cost	$ 0.1	$ 0.1

X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
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-Section 45
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X

- Definition

Weighted average discount rate for operating lease calculated at point in time.

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-Topic 842
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-Section 55
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-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

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X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Topic 842
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X

- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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X

- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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