Note 7 - Investments, Including Investments Accounted for Using the Equity Method - Available for Sale Securities (Details) - US Treasury Notes Securities [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
U.S. Treasury notes, Cost	$ 19,340	$ 20,612
U.S. Treasury notes, Gross Unrealized Gain (Loss)	49	58
U.S. Treasury notes, Fair Value	$ 19,389	$ 20,670