Note 7 - Securities Available for Sale (Details) - Summary of Securities Available for Sale - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Mortgage-backed securities:
Amortized cost	$ 145,233	$ 138,527
Gross unrealized gains	476	188
Gross unrealized losses	(371)	(881)
Fair value	145,338	137,834
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Mortgage-backed securities:
Amortized cost		2,755
Gross unrealized gains		154
Gross unrealized losses		0
Fair value		2,909
Collateralized Mortgage Backed Securities [Member]
Mortgage-backed securities:
Amortized cost	6,979
Gross unrealized gains	104
Gross unrealized losses	(3)
Fair value	7,080
Other Marketable Securities [Member]
Mortgage-backed securities:
Amortized cost	138,254	135,772
Gross unrealized gains	372	34
Gross unrealized losses	(368)	(881)
Fair value	138,258	134,925
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Mortgage-backed securities:
Amortized cost	1,382	1,418
Gross unrealized gains	45	90
Gross unrealized losses	0	0
Fair value	1,427	1,508
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | Collateralized Mortgage Backed Securities [Member]
Mortgage-backed securities:
Amortized cost	1,285
Gross unrealized gains	9
Gross unrealized losses	0
Fair value	1,294
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Mortgage-backed securities:
Amortized cost	2,598	1,337
Gross unrealized gains	41	64
Gross unrealized losses	(1)	0
Fair value	2,638	1,401
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Collateralized Mortgage Backed Securities [Member]
Mortgage-backed securities:
Amortized cost	1,625
Gross unrealized gains	9
Gross unrealized losses	(2)
Fair value	1,632
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Mortgage-backed securities:
Amortized cost	40
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	40
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] | Collateralized Mortgage Backed Securities [Member]
Mortgage-backed securities:
Amortized cost	49
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	49
US Government Agencies Debt Securities [Member] | Other Marketable Securities [Member]
Mortgage-backed securities:
Amortized cost	133,151
Gross unrealized gains	355
Gross unrealized losses	(2)
Fair value	133,504
US States and Political Subdivisions Debt Securities [Member] | Other Marketable Securities [Member]
Mortgage-backed securities:
Amortized cost	4,004
Gross unrealized gains	17
Gross unrealized losses	(6)
Fair value	4,015
Corporate Debt Securities [Member] | Other Marketable Securities [Member]
Mortgage-backed securities:
Amortized cost	341	700
Gross unrealized gains	0	0
Gross unrealized losses	(4)	(280)
Fair value	337	420
Preferred Stock [Member] | Other Marketable Securities [Member]
Mortgage-backed securities:
Amortized cost	700
Gross unrealized gains	0
Gross unrealized losses	(350)
Fair value	350
Equity Securities [Member] | Other Marketable Securities [Member]
Mortgage-backed securities:
Amortized cost	58	58
Gross unrealized gains	0	3
Gross unrealized losses	(6)	0
Fair value	$ 52	61
US Government Agencies Debt Securities [Member] | Other Marketable Securities [Member]
Mortgage-backed securities:
Amortized cost		135,014
Gross unrealized gains		31
Gross unrealized losses		(601)
Fair value		$ 134,444