Note 5 - Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Operating lease expense	$ 181	$ 189
Short term lease expense	21	27
Variable lease expense	22	23
Total operating lease cost	224	239
Amortization of right-of-use assets	31	63
Interest on lease liabilities	91	19
Total finance lease cost	122	82
Operating cash flows used in operating leases	164	164
Operating cash flows used in finance leases	91	19
Financing cash flows used in finance leases	$ 83	$ 132

Amount of interest expense on finance lease liability.

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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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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Amount of operating lease expense. Excludes sublease income.

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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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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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