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Note 4 - Available-for-sale Securities (Details Textual)		6 Months Ended
	May 10, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		10		9
Number of Available-for-sale Securities		12		11
Unrealized Holding Losses Depreciation Percentage from Amortized Cost		5.00%		1.40%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total		$ 0
Proceeds from Sale of Debt Securities, Available-for-sale		0	$ 13,800,000
Debt Securities, Available-for-sale, Realized Gain (Loss), Total			(78,000)
Payments to Acquire Debt Securities, Available-for-sale		0	$ 15,600,000
Securities Acquired in Business Acquisition [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	$ 35,500,000
Debt Securities, Available-for-sale, Realized Gain (Loss), Total	$ 0
Available-For-Sale Securities Pledged to the Federal Reserve Bank of New York to Secure Municipal Deposits [Member]
Debt Securities, Available-for-sale, Restricted		$ 6,200,000		$ 6,700,000

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- Definition

The number of available-for-sale securities held.

+ References

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- Definition

Unrealized holding losses depreciation percentage from amortized cost.

+ References

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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

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
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Amount of restricted 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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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

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Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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