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Note 12 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 02, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Nonrecurring [Member]          
Asset Impairment Charges   $ 0 $ 0 $ 0 $ 0
Conversion from Convertible Notes to Preferred Stock, Principal and Interest [Member]          
Debt Conversion, Converted Instrument, Shares Issued (in shares) 420,000        
Private Company [Member]          
Convertible Debt, Fair Value Disclosures   2,100   2,100  
Convertible Debt Securities [Member] | Private Company [Member]          
Payments to Acquire Equity Securities, FV-NI     $ 2,000    
Equity Securities, FV-NI   $ 2,100   $ 2,100