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Note 1 - General (Details Textual) - USD ($) $ in Thousands		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	[1]
Debt Securities, Held-to-maturity, Total		$ 18,222
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax		(431)
Debt Securities, Available-for-sale, Total		$ 114,568		$ 99,857
Accounting Standards Update 2017-12 [Member]
Debt Securities, Held-to-maturity, Total	$ (23,400)
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
[1] Derived from audited consolidated financial statements.

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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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