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Note 4 - Property and Equipment, Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Depreciation, Depletion and Amortization, Nonproduction $ 88 $ 53 $ 221 $ 104