Note 4 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2013
Finite-lived Intangible Assets, Fair Value Disclosure	$ 2,700	$ 2,700
Loans Serviced for Others Outstanding Principal Balance	350,100	372,200
Core Deposits [Member]
Finite-Lived Intangible Assets, Net	1,300	$ 1,400
Indiana Bank [Member] | Commercial Banking [Member]
Goodwill	$ 682
THE BANCorp [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 2,500