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Note 2 - Investments - Schedule of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Debt Securities, Available-for-sale, Adjusted Cost $ 22,651 $ 22,651
Debt Securities, Available-for-sale, Unrealized Gain 0 0
Debt Securities, Available-for-sale, Unrealized Loss (861) (1,177)
Debt Securities, Available-for-sale, Fair Value 21,790 21,474
Financial instrument, short-term investments 21,790 21,474
Financial instrument, long-term investments 0 0
Corporate & Government Debt Mutual Funds Securities [Member]    
Debt Securities, Available-for-sale, Adjusted Cost 15,276 15,276
Debt Securities, Available-for-sale, Unrealized Gain 0 0
Debt Securities, Available-for-sale, Unrealized Loss (643) (850)
Debt Securities, Available-for-sale, Fair Value 14,633 14,426
Financial instrument, short-term investments 14,633 14,426
Financial instrument, long-term investments 0 0
Corporate & Government Debt ETFs Securities [Member]    
Debt Securities, Available-for-sale, Adjusted Cost 7,375 7,375
Debt Securities, Available-for-sale, Unrealized Gain 0 0
Debt Securities, Available-for-sale, Unrealized Loss (218) (327)
Debt Securities, Available-for-sale, Fair Value 7,157 7,048
Financial instrument, short-term investments 7,157 7,048
Financial instrument, long-term investments $ 0 $ 0