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Note 3 - Business Combinations (Details Textual)					9 Months Ended
	Sep. 30, 2018 USD ($)	Aug. 29, 2018 USD ($)	May 10, 2018 USD ($)	Feb. 06, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Assets, Total	$ 915,286,000				$ 915,286,000		$ 852,080,000
Marketable Securities, Total	44,714,000				44,714,000		30,026,000
Deposits, Total	719,532,000				719,532,000		637,439,000
Goodwill, Ending Balance	1,944,000				$ 1,944,000
Debt Securities, Available-for-sale, Realized Gain (Loss), Total						$ (78,000)
Core Deposits [Member]
Finite-Lived Intangible Asset, Useful Life					10 years
Securities Acquired in Business Acquisition [Member]
Debt Securities, Available-for-sale, Realized Gain (Loss), Total			$ 0
Prime Bank [Member]
Business Combination, Acquisition Related Costs					$ 632,000
Goodwill, Ending Balance	1,944,000		2,100,000		1,944,000
Business Combination, Initial Cash Purchase Price			5,890,000
Business Combination, Final Estimated Purchase Price			1,000,000
Payments to Acquire Businesses, Gross	6,880,000	$ 1,280,000	5,596,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		1,570,000
Business Combination, Contingent Consideration, Liability, Total	$ 477,000	$ 477,000	$ 1,761,000		477,000
Prime Bank [Member] | Core Deposits [Member]
Finite-Lived Intangible Asset, Useful Life			10 years
Prime Bank [Member] | Securities Acquired in Business Acquisition [Member]
Debt Securities, Available-for-sale, Realized Gain (Loss), Total			$ 0
Prime Bank [Member] | Measurement Input, Account Balance Growth Rate [Member]
Core Deposit, Measurement Input			0.03
Hana SBL [Member]
Business Combination, Acquisition Related Costs					$ 993,000
Prime Bank [Member]
Assets, Total			$ 65,000,000
Marketable Securities, Total			36,000,000
Loans Payable, Total			23,000,000
Deposits, Total			$ 46,000,000
Hana SBL [Member]
SBA 7 (a) Loan Amount Originated				$ 1,000,000,000

X

- Definition

The final estimated cash outflow associated with the acquisition of business during the period.

+ References

No definition available.

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- Definition

The initial cash purchase price associated with the acquisition of business during the period.

+ References

No definition available.

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- Definition

Value of input used to measure core deposit.

+ References

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- Definition

Represents the amount of SBA 7 (a) loan amount originated since inception.

+ References

No definition available.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-SubTopic 210
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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-SubTopic 10
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X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Amount of investment in marketable security.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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