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Note 7 - Leases (Details Textual) - USD ($)
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Lease, Cost $ 102,000 $ 136,000
Operating Lease, Lease Income $ 104,000 $ 101,000
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income Other Nonoperating Income
Building [Member]    
Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation   $ 1,700,000
Property, Plant, and Equipment, Lessor Asset under Operating Lease, Accumulated Depreciation   $ 1,600,000
Property, Plant and Equipment, Useful Life (Year)   40 years
Other Assets [Member]    
Lessor, Cost, Contracts Asset $ 0 $ 2,000
General and Administrative Expense [Member]    
Lease, Cost $ 100,000 $ 133,000