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Note 6 - Leases (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sales-type Lease, Lease Income $ 1 $ 1 $ 1 $ 1