Note 7 - Regulatory Capital (Details Textual)	Sep. 30, 2020		Dec. 31, 2019
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum	0.070	[1]	0.040
Parent Company [Member]
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum	0.070	[1]	0.040
Earlier of December 31, 2020 or 60 Days Following End of National Emergency Declared with Respect to COVID-19 [Member]
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum	0.09
Earlier of December 31, 2020 or 60 Days Following End of National Emergency Declared with Respect to COVID-19 [Member] | Parent Company [Member]
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum	0.09

[1] The Community Bank Leverage Ratio will revert to 9% at the earlier of December 31, 2020 and 60 days following the end of the national emergency declared with respect to COVID-19.