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Note 2 - Securities (Details Textual) $ in Thousands		9 Months Ended		12 Months Ended
	Jan. 01, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Weighted Average Re-pricing Term		3 years 182 days		4 years 219 days
Debt Securities, Held-to-maturity, Fair Value, Total		$ 18,259		$ 42,394
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax		(431)
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings		0
Debt Securities, Available-for-sale, Total		$ 114,568		$ 99,857	[1]
Accounting Standards Update 2017-12 [Member]
Debt Securities, Held-to-maturity, Fair Value, Total	$ 23,000
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax	431
Debt Securities, Available-for-sale, Total	$ 23,400
US Agency and Mortgage-backed Securities [Member]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total		33		83
Available-for-Sale Securities, Number of Securities		90		90
Debt Securities, Held-to-maturity, Fair Value, Total		$ 13,069		$ 26,551
Debt Securities, Available-for-sale, Total		$ 87,932		$ 84,922
Municipal Bonds [Member]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total		1		56
Available-for-Sale Securities, Number of Securities		81		82
Debt Securities, Held-to-maturity, Fair Value, Total		$ 3,670		$ 14,334
Debt Securities, Available-for-sale, Total		$ 26,636		$ 14,935
[1] Derived from audited consolidated financial statements.

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The number of investment positions in available-for-sale investments.

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Amount 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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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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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.

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