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Note 7 - Marketable Securities - Fair Value of Available for Sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Adjusted Cost	$ 37,357	$ 30,791
Unrealized Gains	48	10
Unrealized Losses	(1)	(1)
Fair Value	37,404	30,800
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Adjusted Cost	37,357	30,791
Unrealized Gains	48	10
Unrealized Losses	(1)	(1)
Fair Value	$ 37,404	$ 30,800

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