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Note 4 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Equity Securities without Readily Determinable Fair Value, Amount $ 2,100  
Debt Securities, Available-for-Sale 2,760 $ 2,729
GS Engineering [Member]    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 12,800