Note 5 - Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Total loans for credit quality indicators	$ 149,168	$ 130,170
Total loans for credit quality indicators	52,561	49,061
Performing Financial Instruments [Member]
Total loans for credit quality indicators	51,843	47,962
Nonperforming Financial Instruments [Member]
Total loans for credit quality indicators	718	1,099
Pass [Member]
Total loans for credit quality indicators	146,992	126,513
Special Mention [Member]
Total loans for credit quality indicators	1,926	3,298
Substandard [Member]
Total loans for credit quality indicators	250	263
Doubtful [Member]
Total loans for credit quality indicators		96
Commercial Portfolio Segment [Member] | Development [Member]
Total loans for credit quality indicators	7,275	1,498
Commercial Portfolio Segment [Member] | Development [Member] | Pass [Member]
Total loans for credit quality indicators	7,275	1,498
Commercial Portfolio Segment [Member] | Development [Member] | Special Mention [Member]
Total loans for credit quality indicators
Commercial Portfolio Segment [Member] | Development [Member] | Substandard [Member]
Total loans for credit quality indicators
Commercial Portfolio Segment [Member] | Development [Member] | Doubtful [Member]
Total loans for credit quality indicators
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Total loans for credit quality indicators	59,961	53,202
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Pass [Member]
Total loans for credit quality indicators	58,848	51,939
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Special Mention [Member]
Total loans for credit quality indicators	1,113	1,263
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Substandard [Member]
Total loans for credit quality indicators
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Doubtful [Member]
Total loans for credit quality indicators
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Total loans for credit quality indicators	11,008	10,135
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Total loans for credit quality indicators	10,985	9,435
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Total loans for credit quality indicators	23	586
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Total loans for credit quality indicators		114
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Total loans for credit quality indicators
Residential Real Estate and Consumer [Member] | One to Four Family Owner-occupied [Member]
Total loans for credit quality indicators	50,604	47,448
Residential Real Estate and Consumer [Member] | One to Four Family Owner-occupied [Member] | Performing Financial Instruments [Member]
Total loans for credit quality indicators	49,985	46,349
Residential Real Estate and Consumer [Member] | One to Four Family Owner-occupied [Member] | Nonperforming Financial Instruments [Member]
Total loans for credit quality indicators	619	1,099
Residential Real Estate and Consumer [Member] | Consumer [Member]
Total loans for credit quality indicators	1,957	1,613
Residential Real Estate and Consumer [Member] | Consumer [Member] | Performing Financial Instruments [Member]
Total loans for credit quality indicators	1,858	1,613
Residential Real Estate and Consumer [Member] | Consumer [Member] | Nonperforming Financial Instruments [Member]
Total loans for credit quality indicators	99
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member]
Total loans for credit quality indicators	32,971	33,658
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member] | Pass [Member]
Total loans for credit quality indicators	31,931	31,964
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member] | Special Mention [Member]
Total loans for credit quality indicators	790	1,449
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member] | Substandard [Member]
Total loans for credit quality indicators	250	149
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member] | Doubtful [Member]
Total loans for credit quality indicators		96
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member]
Total loans for credit quality indicators	37,953	31,677
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member] | Pass [Member]
Total loans for credit quality indicators	37,953	31,677
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member] | Special Mention [Member]
Total loans for credit quality indicators
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member] | Substandard [Member]
Total loans for credit quality indicators
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member] | Doubtful [Member]
Total loans for credit quality indicators