Note 5 - Loans - Loans Aging Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current loans	$ 200,095	$ 200,584
Loans past due	200,399	200,898
Nonaccrual loans	706	720
Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due	304	314
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due
Commercial Portfolio Segment [Member] | Development [Member]
Current loans	9,723	7,801
Loans past due	9,723	7,801
Nonaccrual loans
Commercial Portfolio Segment [Member] | Development [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due
Commercial Portfolio Segment [Member] | Development [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Current loans	69,953	69,425
Loans past due	69,953	69,425
Nonaccrual loans
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Current loans	11,863	13,076
Loans past due	11,863	13,142
Nonaccrual loans	18	20
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due		66
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due
Residential Real Estate and Consumer [Member] | One to Four Family Owner-occupied [Member]
Current loans	39,502	41,013
Loans past due	39,647	41,018
Nonaccrual loans	359	365
Residential Real Estate and Consumer [Member] | One to Four Family Owner-occupied [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due	145	5
Residential Real Estate and Consumer [Member] | One to Four Family Owner-occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member]
Current loans	32,162	32,069
Loans past due	32,162	32,312
Nonaccrual loans	236	241
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due		243
Residential Real Estate and Consumer [Member] | One to Four Family Investor-owned [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member]
Current loans	34,315	34,467
Loans past due	34,315	34,467
Nonaccrual loans
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due
Residential Real Estate and Consumer [Member] | Multifamily Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due
Residential Real Estate and Consumer [Member] | Consumer [Member]
Current loans	2,577	2,733
Loans past due	2,736	2,733
Nonaccrual loans	93	94
Residential Real Estate and Consumer [Member] | Consumer [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Loans past due	159
Residential Real Estate and Consumer [Member] | Consumer [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due