Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Fair Value Measurements - Fair Value Measurements (Details)

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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Cash equivalents $ 15,244 $ 26,467
Investment securities: 122,375 136,629
Fair Value, Inputs, Level 1 [Member]    
Cash equivalents 15,244 26,467
Investment securities: 0 0
Fair Value, Inputs, Level 2 [Member]    
Cash equivalents 0 0
Investment securities: 122,375 136,629
Fair Value, Inputs, Level 3 [Member]    
Cash equivalents 0 0
Investment securities: 0 0
Money Market Funds [Member]    
Cash equivalents 15,244 26,467
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash equivalents 15,244 26,467
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash equivalents 0 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash equivalents 0 0
Certificates of Deposit [Member]    
Investment securities: 475 8,115
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities: 0 0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]    
Investment securities: 475 8,115
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities: 0 0
US Treasury Securities [Member]    
Investment securities: 121,900 128,514
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities: 0 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Investment securities: 121,900 128,514
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities: $ 0 $ 0