Note 8 - Federal Home Loan Bank of Indianapolis Advances - Maturities of Currently Outstanding FHLBI Bullet Advances (Details) - Bullet Advances [member] - Federal Home Loan Bank of Indianapolis [Member] $ in Millions	Dec. 31, 2023 USD ($)
2024	$ 90
2025	80
2026	80
2027	100
2028	$ 90

Note 8 - Federal Home Loan Bank of Indianapolis Advances - Maturities of Currently Outstanding FHLBI Bullet Advances (Details) - Bullet Advances [member] - Federal Home Loan Bank of Indianapolis [Member]
$ in Millions

Dec. 31, 2023

USD ($)

$ 90

100

$ 90