Note 7 - Held-to-Maturity Investments - Summary of Carrying Values and Fair Values of Financial Instruments (Details) - U.S. Treasury Bills [Member] $ in Thousands	Sep. 30, 2024 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
HTM, amortized cost, Total	$ 41,404
HTM, Gross Unrealized Gains	11
HTM, Gross Unrealized Losses	0
HTM, Estimated Fair Value	$ 41,415