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Note 4 - Fair Value Measurements - Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Interest rate swaps $ 1,261 $ 4,673  
Debt Securities, Available-for-Sale 2,589 2,679 $ 2,600
Equity securities 1,942 2,009  
Contingent consideration (a) [1] 660 660  
Fair Value, Inputs, Level 1 [Member]      
Interest rate swaps 0 0  
Debt Securities, Available-for-Sale 0 0  
Equity securities 0 0  
Contingent consideration (a) [1] 0 0  
Fair Value, Inputs, Level 2 [Member]      
Interest rate swaps 1,261 4,673  
Debt Securities, Available-for-Sale 0 0  
Equity securities 0 0  
Contingent consideration (a) [1] 0 0  
Fair Value, Inputs, Level 3 [Member]      
Interest rate swaps 0 0  
Debt Securities, Available-for-Sale 2,589 2,679  
Equity securities 1,942 2,009  
Contingent consideration (a) [1] 660 660  
Deferred Compensation Plan [Member]      
Marketable securities - deferred compensation plan 5,372 4,917  
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Marketable securities - deferred compensation plan 5,372 4,917  
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Marketable securities - deferred compensation plan 0 0  
Deferred Compensation Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Marketable securities - deferred compensation plan $ 0 $ 0  
[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any deferred compensation that has been earned to date.