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Note 5 - Leases (Details Textual) - USD ($)
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Lease, Cost $ 34,000 $ 35,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability [1] 92,000 0
Amortization of Finance Lease Liability $ 6,000 $ 0
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income
Operating Lease, Lease Income $ 29,000 $ 23,000
General and Administrative Expense [Member]    
Lease, Cost $ 32,000 $ 34,000
[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.