Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Fair Value Measurements - Fair Value Measurements (Details)

v3.22.1
Note 4 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Fair value $ 29,187  
Fair Value, Inputs, Level 1 [Member]    
Fair value 0  
Fair Value, Inputs, Level 2 [Member]    
Fair value 29,187  
Fair Value, Inputs, Level 3 [Member]    
Fair value 0 $ 0
US Treasury Securities [Member]    
Fair value 15,463  
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 0  
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 15,463  
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value 0  
Certificates of Deposit [Member]    
Fair value 13,724  
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 0  
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 13,724  
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value $ 0