Note 5 - Loans and Allowance for Loan Losses - Loans by Aging (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Loans receivable, past due	$ 8,266,000	$ 10,554,000
Loans receivable, current	743,959,000	776,341,000
Loans receivable	752,225,370	786,894,894
Loans receivable, past due and accruing
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable, past due	693,000	2,670,000
Loans receivable, current	120,997,000	129,741,000
Loans receivable	121,690,131	132,410,810
Loans receivable, past due and accruing
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable, past due	5,930,000	5,952,000
Loans receivable, current	87,699,000	84,596,000
Loans receivable	93,628,789	90,548,265
Loans receivable, past due and accruing
Real Estate, Construction [Member]
Loans receivable, past due	581,000
Loans receivable, current	87,594,000	88,554,000
Loans receivable	88,175,253	88,553,995
Loans receivable, past due and accruing
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	853,000	1,081,000
Loans receivable, current	307,418,000	321,840,000
Loans receivable	308,270,953	322,921,323
Loans receivable, past due and accruing
Commercial Portfolio Segment [Member]
Loans receivable, past due	191,000	732,000
Loans receivable, current	108,547,000	118,638,000
Loans receivable	108,738,413	119,369,484
Loans receivable, past due and accruing
Consumer and Other Loans [Member]
Loans receivable, past due	18,000	119,000
Loans receivable, current	31,704,000	32,972,000
Loans receivable	31,721,831	33,091,017
Loans receivable, past due and accruing
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, past due	7,840,000	7,464,000
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable, past due	290,000	177,000
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable, past due	5,930,000	5,952,000
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate, Construction [Member]
Loans receivable, past due	581,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	853,000	1,000,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due	186,000	228,000
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable, past due		107,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, past due	269,000	855,000
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable, past due	246,000	329,000
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate, Construction [Member]
Loans receivable, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due		81,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due	5,000	433,000
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable, past due	18,000	12,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, past due	157,000	2,235,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]
Loans receivable, past due	157,000	2,164,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]
Loans receivable, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate, Construction [Member]
Loans receivable, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due		71,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable, past due