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Note 5 - Loans and Leases and Allowance for Loan and Lease Losses (Details Textual)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of Portfolio Segments	8
Loans Pledged as Collateral	$ 27,000,000	$ 0
Loans and Leases Receivable, Related Parties, Ending Balance	800,000	500,000
Loans and Leases Receivable, Related Parties, Additions	500,000	0
Loans and Leases Receivable, Related Parties, Proceeds	200,000	11,000
Loans and Leases Receivable, Gross, Total	531,198,000	357,458,000
Financing Receivable, Recorded Investment, Nonaccrual Status	3,782,000	2,148,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,238,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	26,000	19,000
Interest Income Recorded	3,000	3,000
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status	100,000	100,000
Financing Receivable, Modifications, Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Loans Modified in a Troubled Debt Restructuring, Individually Evaluated for Impairment, Principal Balance, Threshold	$ 500,000
Allowance for Credit Losses, Change in Method of Calculating Impairment	2,000	$ 2,000
Minimum [Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	500,000
Minimum [Member] | ALC [Member]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	100,000
Financial Asset Acquired with Credit Deterioration [Member]
Loans and Leases Receivable, Gross, Total	2,238,000
Financing Receivable, Recorded Investment, Nonaccrual Status	2,200,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,200,000
Financial Asset Acquired with Credit Deterioration [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Leases Receivable, Gross, Total	200,000
Financial Asset Acquired with Credit Deterioration [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Leases Receivable, Gross, Total	2
Financial Asset Acquired with Credit Deterioration [Member] | Substandard [Member]
Loans and Leases Receivable, Gross, Total	$ 2,200,000
Real Estate [Member]
Percentage of Loan Portfolio	63.60%	54.00%

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- Definition

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+ References

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Interest income recorded.

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- Definition

Represents the threshold used in determining which loans that have been modified in a troubled debt restructuring are considered impaired and evaluated individually for impairment. All such loans with a principal balance above this threshold are considered impaired and evaluated individually for impairment.

+ References

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- Definition

Represents the number of portfolio segments into which the Company has divided the loan portfolio as of the balance sheet date.

+ References

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Represents the percentage of the loan portfolio that is concentrated in a certain category.

+ References

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- Definition

Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings.

+ References

No definition available.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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