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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Total $ 150,466 $ 159,578
US Treasury Bill Securities [Member]    
Investments, fair value [1] 76,730 91,319
US Treasury Notes Securities [Member]    
Investments, fair value [1] 50,426 34,772
Money Market Funds [Member]    
Cash and cash equivalents, fair value [2] 23,310 33,487
Fair Value, Inputs, Level 1 [Member]    
Total 23,310 33,487
Fair Value, Inputs, Level 1 [Member] | US Treasury Bill Securities [Member]    
Investments, fair value [1] 0 0
Fair Value, Inputs, Level 1 [Member] | US Treasury Notes Securities [Member]    
Investments, fair value [1] 0 0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Cash and cash equivalents, fair value [2] 23,310 33,487
Fair Value, Inputs, Level 2 [Member]    
Total 127,156 126,091
Fair Value, Inputs, Level 2 [Member] | US Treasury Bill Securities [Member]    
Investments, fair value [1] 76,730 91,319
Fair Value, Inputs, Level 2 [Member] | US Treasury Notes Securities [Member]    
Investments, fair value [1] 50,426 34,772
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]    
Cash and cash equivalents, fair value [2] 0 0
Fair Value, Inputs, Level 3 [Member]    
Total 0 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Bill Securities [Member]    
Investments, fair value [1] 0 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Notes Securities [Member]    
Investments, fair value [1] 0 0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]    
Cash and cash equivalents, fair value [2] $ 0 $ 0
[1] We have current and non-current debt securities (U.S. Treasury bills and notes) intended to enhance returns on our cash as well as to fund future obligations.
[2] Our corporate money market funds are readily convertible into cash and the net asset value of each fund on the last day of the quarter is used to determine its fair value.