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Note 4 - Property and Equipment (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 03, 2020
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Depreciation, Depletion and Amortization, Nonproduction, Total   $ 53 $ 12 $ 104 $ 48
Austin, Texas [Member]          
Leasehold Improvement Assets, Net, Write-off $ 229