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Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term securities $ 7,945 $ 1,481
Long-term Securities 249  
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost basis 8,639 3,798
Unrealized Gain 8 0
Unrealized loss 0 (10)
Fair value 8,647 3,788
Cash equivalents 453 2,307
Short-term securities 7,945 1,481
Long-term Securities 249 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost basis 301 2,307
Unrealized Gain 0 0
Unrealized loss 0 0
Fair value 301 2,307
Cash equivalents 301 2,307
Short-term securities 0 0
Long-term Securities 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost basis 8,338 1,491
Unrealized Gain 8 0
Unrealized loss 0 (10)
Fair value 8,346 1,481
Cash equivalents 152 0
Short-term securities 7,945 1,481
Long-term Securities 249 0
Certificates of Deposit [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost basis 401 301
Unrealized Gain 0 0
Unrealized loss 0 0
Fair value 401 301
Cash equivalents 152 0
Short-term securities 0 301
Long-term Securities 249 0
U.S. Government Agency Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost basis 2,591  
Unrealized Gain 3  
Unrealized loss 0  
Fair value 2,594  
Short-term securities 2,594  
Long-term Securities 0  
Municipal Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost basis 2,127 926
Unrealized Gain 2 0
Unrealized loss 0 (7)
Fair value 2,129 919
Cash equivalents 0 0
Short-term securities 2,129 919
Long-term Securities 0 0
Corporate Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost basis 3,219 264
Unrealized Gain 3 0
Unrealized loss 0 (3)
Fair value 3,222 261
Cash equivalents 0 0
Short-term securities 3,222 261
Long-term Securities $ 0 $ 0