Note 8 - Loans and Allowance for Credit Losses - Net (Charge-offs) Recoveries (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net (charge-offs)/recoveries	$ (129,373)	$ (27,413)
Residential Portfolio Segment [Member] | One- to Four-family Loan [Member]
Net (charge-offs)/recoveries	(109,876)	(2,283)
Residential Portfolio Segment [Member] | Multi-family Loans [Member]
Net (charge-offs)/recoveries	3,971	3,972
Nonresidential Real Estate Portfolio Segment [Member]
Net (charge-offs)/recoveries
Consumer Portfolio Segment [Member]
Net (charge-offs)/recoveries	353	1,727
Purchased Auto Loans [Member]
Net (charge-offs)/recoveries	$ (23,821)	$ (30,829)