Note 3 - Loans Receivable and Allowance for Loan Losses - Delinquency Status of Performing and Non-performing Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Non-accruing loans	$ 1,859	$ 1,821
Loans receivable, gross	679,088	581,657
Performing Financial Instruments [Member]
Performing (accruing) loans, past due	5,975	1,718
Performing (accruing) loans, current	671,254	578,118
Loans receivable, gross	677,229	579,836
Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	3,631	253
Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	147	13
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	2,197	1,452
Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	280,059	271,229
Commercial Real Estate Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	3,097
Performing (accruing) loans, current	276,962	271,229
Loans receivable, gross	280,059	271,229
Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	3,097
Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Residential Portfolio Segment [Member]
Non-accruing loans	1,590	1,590
Loans receivable, gross	152,428	86,514
Residential Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	1,934	1,589
Performing (accruing) loans, current	148,904	83,335
Loans receivable, gross	150,838	84,924
Residential Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	478	131
Residential Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	9	9
Residential Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	1,447	1,449
Commercial Portfolio Segment [Member]
Non-accruing loans	269	231
Loans receivable, gross	94,884	60,977
Commercial Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	801	51
Performing (accruing) loans, current	93,814	60,695
Loans receivable, gross	94,615	60,746
Commercial Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	47	47
Commercial Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	4	4
Commercial Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	750
Consumer Portfolio Segment [Member]
Loans receivable, gross	94,830	101,449
Construction Portfolio Segment [Member]
Loans receivable, gross	49,222	53,895
Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross	7,665	7,593
Pass [Member]
Non-accruing loans
Loans receivable, gross	649,104	573,850
Pass [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	2,878	1,718
Performing (accruing) loans, current	646,226	572,132
Loans receivable, gross	649,104	573,850
Pass [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	534	253
Pass [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	147	13
Pass [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	2,197	1,452
Pass [Member] \| Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	252,424	265,246
Pass [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	252,424	265,246
Loans receivable, gross	252,424	265,246
Pass [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Pass [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Pass [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Pass [Member] \| Residential Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	150,838	84,924
Pass [Member] \| Residential Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	1,934	1,589
Performing (accruing) loans, current	148,904	83,335
Loans receivable, gross	150,838	84,924
Pass [Member] \| Residential Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	478	131
Pass [Member] \| Residential Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	9	9
Pass [Member] \| Residential Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	1,447	1,449
Pass [Member] \| Commercial Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	94,125	60,743
Pass [Member] \| Commercial Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	801	51
Performing (accruing) loans, current	93,324	60,692
Loans receivable, gross	94,125	60,743
Pass [Member] \| Commercial Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	47	47
Pass [Member] \| Commercial Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	4	4
Pass [Member] \| Commercial Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	750
Pass [Member] \| Consumer Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	94,830	101,449
Pass [Member] \| Consumer Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	143	78
Performing (accruing) loans, current	94,687	101,371
Loans receivable, gross	94,830	101,449
Pass [Member] \| Consumer Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	9	75
Pass [Member] \| Consumer Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	134
Pass [Member] \| Consumer Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due		3
Pass [Member] \| Construction Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	49,222	53,895
Pass [Member] \| Construction Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	49,222	53,895
Loans receivable, gross	49,222	53,895
Pass [Member] \| Construction Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Pass [Member] \| Construction Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Pass [Member] \| Construction Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Pass [Member] \| Construction to Permanent Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	7,665	7,593
Pass [Member] \| Construction to Permanent Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	7,665	7,593
Loans receivable, gross	7,665	7,593
Pass [Member] \| Construction to Permanent Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Pass [Member] \| Construction to Permanent Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Pass [Member] \| Construction to Permanent Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Special Mention [Member]
Non-accruing loans
Loans receivable, gross	16,421	4,531
Special Mention [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	16,421	4,531
Loans receivable, gross	16,421	4,531
Special Mention [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Special Mention [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Special Mention [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Special Mention [Member] \| Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	16,421	4,531
Special Mention [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Performing (accruing) loans, current	16,421	4,531
Loans receivable, gross	16,421	4,531
Special Mention [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Special Mention [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Special Mention [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Substandard [Member]
Non-accruing loans	1,859	1,821
Loans receivable, gross	13,563
Substandard [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	3,097
Performing (accruing) loans, current	8,607
Loans receivable, gross	11,704
Substandard [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	3,097
Substandard [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Substandard [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member]
Non-accruing loans
Loans receivable, gross	11,214	1,452
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	3,097	0
Performing (accruing) loans, current	8,117	1,452
Loans receivable, gross	11,214	1,452
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	3,097	0
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Substandard [Member] \| Residential Portfolio Segment [Member]
Non-accruing loans	1,590	1,590
Loans receivable, gross	1,590	1,590
Substandard [Member] \| Residential Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Performing (accruing) loans, current
Loans receivable, gross
Substandard [Member] \| Residential Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Substandard [Member] \| Residential Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Substandard [Member] \| Residential Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due	0	0
Substandard [Member] \| Commercial Portfolio Segment [Member]
Non-accruing loans	269	231
Loans receivable, gross	759	234
Substandard [Member] \| Commercial Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	490	3
Loans receivable, gross	490	3
Substandard [Member] \| Commercial Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Substandard [Member] \| Commercial Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Substandard [Member] \| Commercial Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Substandard [Member] \| Consumer Portfolio Segment [Member]
Non-accruing loans		1,821
Loans receivable, gross		3,276
Substandard [Member] \| Consumer Portfolio Segment [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current		1,455
Loans receivable, gross		1,455
Substandard [Member] \| Consumer Portfolio Segment [Member] \| Financing Receivables, 30 to 59 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Substandard [Member] \| Consumer Portfolio Segment [Member] \| Financing Receivables, 60 to 89 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due
Substandard [Member] \| Consumer Portfolio Segment [Member] \| Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Performing Financial Instruments [Member]
Performing (accruing) loans, past due

Note 3 - Loans Receivable and Allowance for Loan Losses - Delinquency Status of Performing and Non-performing Loans (Details) - USD ($)
$ in Thousands