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Note 9 - Debt (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 05, 2022
Sep. 03, 2021
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Feb. 13, 2020
Sep. 05, 2019
Interest Paid, Excluding Capitalized Interest, Operating Activities     $ 66 $ 8      
Secured Promissory Note (2019 Note) [Member]              
Repayments of Debt $ 500 $ 1,000          
Interest Paid, Excluding Capitalized Interest, Operating Activities $ 55 330          
Notes Payable, Total         $ 500    
Secured Promissory Note (2019 Note) [Member] | Chief Executive Officer and Board of Directors Chairman, Thomas B. Pickens III [Member]              
Debt Instrument, Face Amount             $ 1,500
Secured Promissory Note, (2020 Note) [Member]              
Repayments of Debt   1,000          
Interest Paid, Excluding Capitalized Interest, Operating Activities   $ 172          
Secured Promissory Note, (2020 Note) [Member] | Chief Executive Officer and Board of Directors Chairman, Thomas B. Pickens III [Member]              
Debt Instrument, Face Amount           $ 1,000  
Secured Promissory Notes, "Original Notes" [Member] | Chief Executive Officer and Board of Directors Chairman, Thomas B. Pickens III [Member]              
Debt Instrument, Interest Rate, Stated Percentage           11.00%