Note 10 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Federal income tax expense	$ 360	$ 363	$ 935	$ 966
Net Income (Loss) Attributable to Parent, Total	2,162	1,945	5,465	5,378
Reclassification out of Accumulated Other Comprehensive Income [Member]
Federal income tax expense	0	0	(4)	9
Net Income (Loss) Attributable to Parent, Total	0	0	14	(35)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Unrealized gains (losses) on available-for-sale securities	$ 0	$ 0	$ 18	$ (44)