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Note 12 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Lease, Weighted Average Remaining Lease Term (Year)	3 years 7 months 28 days		3 years 7 months 28 days
Operating Lease, Weighted Average Discount Rate, Percent	5.99%		5.99%
Operating Lease, Payments			$ 0.3	$ 0.6
General and Administrative Expense [Member]
Operating Lease, Cost	$ 0.1	$ 0.2	0.3	0.7
Variable Lease, Cost	0.1	0.1	0.1	0.1
Short-Term Lease, Cost	$ 0.1	$ 0.1	$ 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.

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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.

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- Definition

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

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- 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.

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- Definition

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

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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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