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Note 7 - Common Stock (Details Textual) - USD ($)
3 Months Ended 4 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2025
Sep. 09, 2025
Jun. 30, 2025
Shares Authorized (in shares) 15,000,000     15,000,000    
Common Stock, Shares Authorized (in shares) 13,000,000     13,000,000   13,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01     $ 0.01   $ 0.01
Stock Repurchased and Retired During Period, Value $ 2,787,000 $ 1,013,000 $ 4,558,000      
Share Repurchase Program Authorized on September 9, 2025 [Member]            
Share Repurchase Program, Authorized, Amount         $ 10,000,000  
Stock Repurchased and Retired During Period, Shares (in shares)       146,441    
Stock Repurchased and Retired During Period, Value       $ 3,766,000    
Stock Repurchased During the Period, Share Price (in dollars per share)       $ 25.72    
Not Designated as Hedging Instrument [Member]            
Shares Authorized (in shares) 2,000,000     2,000,000