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Note 4 - Available-for-sale Securities (Details Textual)		3 Months Ended	9 Months Ended
	May 10, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		13	13		9
Number of Available-for-sale Securities		17	17		11
Unrealized Holding Losses Depreciation Percentage from Amortized Cost		3.70%	3.70%		1.40%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total			$ 0
Proceeds from Sale of Debt Securities, Available-for-sale				$ 13,800,000
Debt Securities, Available-for-sale, Realized Gain (Loss), Total				(78,000)
Payments to Acquire Debt Securities, Available-for-sale			0	$ 20,600,000
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
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Payments to Acquire Debt Securities, Available-for-sale		$ 15,600,000
US Treasury Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale		1,500,000
Available-For-Sale Securities Pledged to the Federal Reserve Bank of New York to Secure Municipal Deposits [Member]
Debt Securities, Available-for-sale, Restricted		$ 7,300,000	$ 7,300,000		$ 6,700,000

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- Definition

The number of available-for-sale securities held.

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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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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).

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