Note 5 - Loans and Allowance for Loan Losses - Loans by Aging (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Loans receivable, past due	$ 15,494,000	$ 10,554,000
Loans receivable, current	743,956,000	776,341,000
Loans receivable	759,450,047	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	1,778,000	2,670,000
Loans receivable, current	123,064,000	129,741,000
Loans receivable	124,842,472	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	82,526,000	84,596,000
Loans receivable	88,455,671	90,548,265
Loans receivable, past due and accruing
Real Estate, Construction [Member]
Loans receivable, past due	4,648,000
Loans receivable, current	95,714,000	88,554,000
Loans receivable	100,361,625	88,553,995
Loans receivable, past due and accruing
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	2,082,000	1,081,000
Loans receivable, current	298,291,000	321,840,000
Loans receivable	300,373,462	322,921,323
Loans receivable, past due and accruing
Commercial Portfolio Segment [Member]
Loans receivable, past due	887,000	732,000
Loans receivable, current	113,100,000	118,638,000
Loans receivable	113,987,142	119,369,484
Loans receivable, past due and accruing
Consumer and Other Loans [Member]
Loans receivable, past due	169,000	119,000
Loans receivable, current	31,261,000	32,972,000
Loans receivable	31,429,675	33,091,017
Loans receivable, past due and accruing
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable, past due	13,315,000	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	1,451,000	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	4,008,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	1,231,000	1,000,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due	682,000	228,000
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable, past due	13,000	107,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable, past due	1,419,000	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	164,000	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	640,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, past due	304,000	81,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable, past due	205,000	433,000
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer and Other Loans [Member]
Loans receivable, past due	106,000	12,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable, past due	760,000	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	163,000	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	547,000
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	$ 50,000