Note 6 - Securities - Summary of Small Business Investment Companies and Financial Technology Funds (Details) - Small Business Investment Companies and Financial Technology Funds [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Investment	$ 14,242	$ 8,005
Mc Larty Capital Partners SBIC L.P [Member]
Investment	878	1,432
McLarty Capital Partners SBIC II, L.P. [Member]
Investment	2,437	2,246
Firmament Capital Partners, SBIC III [Member]
Investment	1,787	1,033
Bluehenge Capital Secured Debt SBIC L.P [Member]
Investment	3,934	1,682
Bluehenge Capital Secured Debt SBIC II, L.P. [Member]
Investment	296	0
New Louisiana Angel Fund 2, LLC [Member]
Investment	49	37
Pharos Capital Partners, IV-A, LP [Member]
Investment	356	211
Valesco Fund II, LP [Member]
Investment	1,147	0
GP Capital Partners, LP [Member]
Investment	277	0
BankTech Ventures, LP [Member]
Investment	77	60
Jam Fintop Banktech, LP [Member]
Investment	340	161
Ledyard Capital Managers, LLC [Member]
Investment	928	989
Mendon Ventures Banktech Fund I, LP [Member]
Investment	896	154
Castle Creek Launchpad Fund I, LP [Member]
Investment	211	0
Work America Capital Fund I, LP [Member]
Investment	$ 629	$ 0