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Note 7 - Marketable Securities - Fair Value of Available for Sale Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Adjusted Cost	$ 36,867	$ 30,791
Unrealized Gains	4	10
Unrealized Losses	(2)	(1)
Fair Value	36,869	30,800
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Adjusted Cost	36,867	30,791
Unrealized Gains	4	10
Unrealized Losses	(2)	(1)
Fair Value	$ 36,869	$ 30,800

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