Note 3 - Securities (Details) - Held-to-maturity Securities (Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities:
Held-to-maturity securities, amortized cost	$ 56,523	$ 60,993
Held-to-maturity securities, gross unrealized gains	1,485	1,626
Held-to-maturity securities, approximate fair value	$ 58,008	$ 62,619