Note 6 - Securities - Summary of Small Business Investment Companies and Financial Technology Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment	$ 16,024	$ 14,242
Mc Larty Capital Partners SBIC L.P [Member]
Investment	457	878
McLarty Capital Partners SBIC II, L.P. [Member]
Investment	2,520	2,437
Firmament Capital Partners, SBIC III [Member]
Investment	1,870	1,787
Firmament Capital Partners SBIC IV, L.P. [Member]
Investment	493	0
Bluehenge Capital Secured Debt SBIC L.P [Member]
Investment	3,220	3,934
Bluehenge Capital Secured Debt SBIC II, L.P. [Member]
Investment	1,146	296
New Louisiana Angel Fund 2, LLC [Member]
Investment	49	49
Pharos Capital Partners, IV-A, LP [Member]
Investment	457	356
Valesco Fund II, LP [Member]
Investment	1,227	1,147
Valesco Fund III, LP [Member]
Investment	37	0
GP Capital Partners, LP [Member]
Investment	624	277
BankTech Ventures, LP [Member]
Investment	284	77
Jam Fintop Banktech, LP [Member]
Investment	531	340
Ledyard Capital Managers, LLC [Member]
Investment	769	928
Mendon Ventures Banktech Fund I, LP [Member]
Investment	1,308	896
Castle Creek Launchpad Fund I, LP [Member]
Investment	607	211
Work America Capital Fund I, LP [Member]
Investment	$ 425	$ 629