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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Jun. 30, 2024
Assets, Fair Value Disclosure $ 143,315 $ 159,578
US Treasury Bill Securities [Member]    
Investments, fair value [1] 107,202 91,319
US Treasury Notes Securities [Member]    
Investments, fair value [1] 10,041 34,772
Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure 26,072 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 2 [Member]    
Assets, Fair Value Disclosure 117,243 126,091
Fair Value, Inputs, Level 2 [Member] | US Treasury Bill Securities [Member]    
Investments, fair value [1] 107,202 91,319
Fair Value, Inputs, Level 2 [Member] | US Treasury Notes Securities [Member]    
Investments, fair value [1] 10,041 34,772
Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure 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
Money Market Funds [Member]    
Cash and cash equivalents, fair value [2] 26,072 33,487
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents, fair value [2] 26,072 33,487
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents, fair value [2] 0 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [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.