Note 2 - Securities (Details Textual) $ in Thousands		6 Months Ended		12 Months Ended
	Jan. 01, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Weighted Average Re-pricing Term		3 years 255 days		4 years 219 days
Debt Securities, Held-to-maturity, Fair Value, Total		$ 18,796		$ 42,394
Debt Securities, Available-for-sale, Total		119,510		$ 99,857	[1]
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax		$ (431)
Accounting Standards Update 2017-12 [Member]
Debt Securities, Held-to-maturity, Fair Value, Total	$ 23,000
Debt Securities, Available-for-sale, Total	23,400
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax	$ 431
US Agency and Mortgage-backed Securities [Member]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total		39		83
Available-for-Sale Securities, Number of Securities		90		90
Debt Securities, Held-to-maturity, Fair Value, Total		$ 13,610		$ 26,551
Debt Securities, Available-for-sale, Total		$ 92,683		$ 84,922
Municipal Bonds [Member]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total		4		56
Available-for-Sale Securities, Number of Securities		83		82
Debt Securities, Held-to-maturity, Fair Value, Total		$ 3,664		$ 14,334
Debt Securities, Available-for-sale, Total		$ 26,827		$ 14,935

[1] Derived from audited consolidated financial statements.