Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Delinquency Status of Performing and Non-performing Loans (Details) - Business Activities Loans [Member] - USD ($) $ in Thousands	Jun. 30, 2019		Dec. 31, 2018
Loans receivable, gross	$ 811,777	[1]	$ 780,376
Non-accruing loans	19,405		19,186
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	311,760		274,938
Non-accruing loans	12,393		3,525
Residential Portfolio Segment [Member]
Loans receivable, gross	163,025		157,300
Non-accruing loans	3,450		2,006
Commercial Portfolio Segment [Member]
Loans receivable, gross	181,204		191,852
Non-accruing loans	2,712		4,681
Consumer Portfolio Segment [Member]
Loans receivable, gross	100,360		94,569
Non-accruing loans	850		174
Construction Portfolio Segment [Member]
Loans receivable, gross	44,180		46,040
Non-accruing loans			8,800
Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross	11,248		15,677
Non-accruing loans
Pass [Member]
Loans receivable, gross	771,246		744,663
Non-accruing loans
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	292,159		262,858
Non-accruing loans
Pass [Member] | Residential Portfolio Segment [Member]
Loans receivable, gross	157,737		152,963
Non-accruing loans
Pass [Member] | Commercial Portfolio Segment [Member]
Loans receivable, gross	166,412		181,530
Non-accruing loans
Pass [Member] | Consumer Portfolio Segment [Member]
Loans receivable, gross	99,510		94,395
Non-accruing loans
Pass [Member] | Construction Portfolio Segment [Member]
Loans receivable, gross	44,180		37,240
Non-accruing loans
Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross	11,248		15,677
Non-accruing loans
Special Mention [Member]
Loans receivable, gross	1,980		6,960
Non-accruing loans
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	806		3,631
Non-accruing loans
Special Mention [Member] | Residential Portfolio Segment [Member]
Loans receivable, gross			850
Non-accruing loans
Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans receivable, gross	1,174		2,479
Non-accruing loans
Substandard [Member]
Loans receivable, gross	38,551		28,753
Non-accruing loans	19,405		19,186
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	18,795		8,449
Non-accruing loans	12,393		3,525
Substandard [Member] | Residential Portfolio Segment [Member]
Loans receivable, gross	5,288		3,487
Non-accruing loans	3,450		2,006
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans receivable, gross	13,618		7,843
Non-accruing loans	2,712		4,681
Substandard [Member] | Commercial and Industrial Portfolio Segment [Member]
Non-accruing loans			4,681
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans receivable, gross	850		174
Non-accruing loans	850		174
Substandard [Member] | Construction Portfolio Segment [Member]
Loans receivable, gross			8,800
Non-accruing loans			8,800
Performing Financial Instruments [Member]
Performing (accruing) loans, past due	4,174		5,386
Performing (accruing) loans, current	788,198		755,804
Loans receivable, gross	792,372		761,190
Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	1,584		1,551
Performing (accruing) loans, current	297,783		269,862
Loans receivable, gross	299,367		271,413
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	543		1,454
Performing (accruing) loans, current	159,032		153,840
Loans receivable, gross	159,575		155,294
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	604		1,338
Performing (accruing) loans, current	177,888		185,833
Loans receivable, gross	178,492		187,171
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	1,443		43
Performing (accruing) loans, current	98,067		94,352
Loans receivable, gross	99,510		94,395
Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due			1,000
Performing (accruing) loans, current	44,180		36,240
Loans receivable, gross	44,180		37,240
Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	11,248		15,677
Loans receivable, gross	11,248		15,677
Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	3,924		4,157
Performing (accruing) loans, current	767,322		740,506
Loans receivable, gross	771,246		744,663
Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	1,584		423
Performing (accruing) loans, current	290,575		262,435
Loans receivable, gross	292,159		262,858
Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	543		1,454
Performing (accruing) loans, current	157,194		151,509
Loans receivable, gross	157,737		152,963
Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	354		1,237
Performing (accruing) loans, current	166,058		180,293
Loans receivable, gross	166,412		181,530
Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	1,443		43
Performing (accruing) loans, current	98,067		94,352
Loans receivable, gross	99,510		94,395
Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due			1,000
Performing (accruing) loans, current	44,180		36,240
Loans receivable, gross	44,180		37,240
Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	11,248		15,677
Loans receivable, gross	11,248		15,677
Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due			1,059
Performing (accruing) loans, current	1,980		5,901
Loans receivable, gross	1,980		6,960
Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due			958
Performing (accruing) loans, current	806		2,673
Loans receivable, gross	806		3,631
Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current			850
Loans receivable, gross			850
Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due			101
Performing (accruing) loans, current	1,174		2,378
Loans receivable, gross	1,174		2,479
Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due	250		170
Performing (accruing) loans, current	18,896		9,397
Loans receivable, gross	19,146		9,567
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due			170
Performing (accruing) loans, current	6,402		4,754
Loans receivable, gross	6,402		4,924
Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current	1,838		1,481
Loans receivable, gross	1,838		1,481
Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	250
Performing (accruing) loans, current	10,656		3,162
Loans receivable, gross	10,906		3,162
Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current
Loans receivable, gross
Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Performing (accruing) loans, current
Loans receivable, gross
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member]
Performing (accruing) loans, past due	1,764		1,400
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	962		593
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	543		637
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	244		150
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	15		20
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	1,764		1,230
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	962		423
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due	543		637
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	244		150
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	15		20
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due			170
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due			170
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 30 to 59 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member]
Performing (accruing) loans, past due	2,138		2,670
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	622
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due			817
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	110		853
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	1,406
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due			1,000
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	2,138		2,670
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due	622
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due			817
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	110		853
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	1,406
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due			1,000
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, 60 to 89 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member]
Performing (accruing) loans, past due	272		1,316
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due			958
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	250		335
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	22		23
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member]
Performing (accruing) loans, past due	22		257
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due			234
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due	22		23
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Pass [Member] | Construction to Permanent Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member]
Performing (accruing) loans, past due			1,059
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due			958
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Performing (accruing) loans, past due			101
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member]
Performing (accruing) loans, past due	250
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Performing (accruing) loans, past due	250
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Performing (accruing) loans, past due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Performing Financial Instruments [Member] | Substandard [Member] | Construction Portfolio Segment [Member]
Performing (accruing) loans, past due

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