Note 2 - Business Combinations - Assets and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 05, 2016	Sep. 30, 2016	Dec. 31, 2015
Milton Bancorp, Inc [Member]
Consideration:
Cash	$ 7,431
Equity Instruments	11,444
Fair value of total consideration transferred	18,875
Recognized amounts of identifiable assets acquired and liabilities assumed
Cash and cash equivalents	9,117
Securities	5,868
Restricted investments in bank stock	364
Loans	113,298
Premises and equipment	2,216
Other real estate owned	641
Bank owned life insurance	272
Other assets	520
Total assets acquired	132,296
Deposits	119,215
Other liabilities	(9)
Total liabilities assumed	119,206
Total identifiable net assets	13,090
Goodwill	5,785
	$ 18,875
Goodwill		$ 7,052	$ 1,267