Note 9 - Allowance for Loan Losses and Credit Quality Information - Purchased Loans Acquired Through Acquisition (Details) - USD ($)	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016
Purchased Performing Loans [Member]
Balance at March 31, 2016	$ 15,940,000
Balance at March 31, 2016	(211,000)	$ (388,000)
Balance at March 31, 2016	15,552,000
Loans acquired during the period	11,772,000
Loans acquired during the period	11,561,000
Change due to payments/refinances	3,179,000
Change due to payments/refinances	78,000
Change due to payments/refinances	3,101,000
Balance at June 30, 2016	24,533,000
Balance at June 30, 2016	(521,000)
Balance at June 30, 2016	24,012,000
Purchased Credit Impaired Loans [Member]
Balance at March 31, 2016	413,000
Balance at March 31, 2016	351,000
Loans acquired during the period	329,000
Loans acquired during the period	292,000
Change due to payments/refinances	5,000
Change due to payments/refinances	(1,000)
Balance at June 30, 2016	737,000
Balance at June 30, 2016	644,000
Balance at March 31, 2016	(93,000)	$ (62,000)
Loans acquired during the period	(37,000)
Change due to payments/refinances	6,000
Balance at June 30, 2016	$ 600,000