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Note 6 - Fair Value Measurements - Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Unrealized loss position, less than 12 months, fair value $ 3,118 $ 684
Unrealized loss position, less than 12 months, gross unrealized loss (3) (2)
Unrealized loss position, more than 12 months, fair value 0 496
Unrealized loss position, more than 12 months, gross unrealized loss 0 (8)
Unrealized loss position, fair value 3,118 10
Unrealized loss position, gross unrealized loss (3) (1,180)
Short-term Securities 3 1,180
Long-term Securities (3,118) (10)
Certificates of Deposit [Member]    
Unrealized loss position, less than 12 months, fair value 0 0
Unrealized loss position, less than 12 months, gross unrealized loss 0 0
Unrealized loss position, more than 12 months, fair value 0 0
Unrealized loss position, more than 12 months, gross unrealized loss 0 0
Unrealized loss position, fair value 0 0
Unrealized loss position, gross unrealized loss 0 0
Short-term Securities (0) (0)
Long-term Securities 0 0
US Treasury and Government [Member]    
Unrealized loss position, less than 12 months, fair value 0 0
Unrealized loss position, less than 12 months, gross unrealized loss 0 0
Unrealized loss position, more than 12 months, fair value 0 0
Unrealized loss position, more than 12 months, gross unrealized loss 0 0
Unrealized loss position, fair value 0 0
Unrealized loss position, gross unrealized loss 0 0
Short-term Securities (0) (0)
Long-term Securities 0 0
US States and Political Subdivisions Debt Securities [Member]    
Unrealized loss position, less than 12 months, fair value 806 684
Unrealized loss position, less than 12 months, gross unrealized loss 0 (2)
Unrealized loss position, more than 12 months, fair value 0 235
Unrealized loss position, more than 12 months, gross unrealized loss 0 (5)
Unrealized loss position, fair value 806 919
Unrealized loss position, gross unrealized loss 0 (7)
Short-term Securities (0) 7
Long-term Securities (806) (919)
Corporate Debt Securities [Member]    
Unrealized loss position, less than 12 months, fair value 2,312 0
Unrealized loss position, less than 12 months, gross unrealized loss (3) 0
Unrealized loss position, more than 12 months, fair value 0 261
Unrealized loss position, more than 12 months, gross unrealized loss 0 (3)
Unrealized loss position, fair value 2,312 261
Unrealized loss position, gross unrealized loss (3) (3)
Short-term Securities 3 3
Long-term Securities $ (2,312) $ (261)