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Note 5 - Leases - Lease Expense (Details) - USD ($)
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Amortization of right-of-use assets $ 14,000 $ 8,000  
Interest on lease liabilities 2,000 1,000  
Total finance lease cost 16,000 9,000  
Short-term lease cost 18,000 26,000  
Total lease cost 34,000 35,000  
Operating cash flows from financing leases included in lease liabilities 0 1,000  
Financing cash flows from financing leases included in lease liabilities 8,000 8,000  
Lease liabilities obtained from new ROU assets - financing [1] $ 92,000 $ 0  
Weighted-average remaining lease term - financing leases (years) (Year) 3 years 3 months   3 months
Weighted-average discount rate - financing leases 7.50%   4.75%
[1] During the three months ended September 30, 2025, non-cash changes in lease liabilities included $92,000 of new right-of-use assets recognized in exchange for new lease liabilities and $6,000 of amortization of lease liabilities during rent-free periods. There were no non-cash changes in lease liabilities during the three months ended September 30, 2024.