Note 4 - Loans (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Note 4 - Loans (Details) [Line Items]
Education Loans Recorded Investment		$ 2,600,000		$ 2,600,000
Net Loss On Sale of Student Loans	$ 0	0	$ 0	13,000
Impaired Financing Receivable, Minimum Outstanding Balance Threshold			100,000
Loans and Leases Receivable, Allowance	10,328,000	12,175,000	10,328,000	12,175,000	$ 11,520,000
Financing Receivable, Recorded Investment, Nonaccrual Status	5,800,000		$ 5,800,000		5,500,000
Loans Still Classified As Non-accrual Status Period of Past Due			90 days
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		$ 0		0
Financing Receivable, Collectively Evaluated for Impairment	672,017,000		672,017,000		659,698,000
Impaired Financing Receivable, Recorded Investment	10,207,000		10,207,000		9,796,000
Impaired Financing Receivable, Related Allowance	315,000		315,000		384,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	96,000	$ 104,000	187,000	$ 207,000
Financing Receivable, Modifications, Recorded Investment	$ 9,700,000		$ 9,700,000		9,000,000
Financing Receivable, Modifications, Number of Contracts	4	5	7	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,825,000	$ 261,000	$ 2,577,000	$ 874,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0	1	0
Non-accrual Loans [Member]
Note 4 - Loans (Details) [Line Items]
Financing Receivable, Collectively Evaluated for Impairment	$ 800,000		$ 800,000		1,000,000
Performing Financial Instruments [Member]
Note 4 - Loans (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,300,000		5,300,000		5,300,000
Nonperforming Financial Instruments [Member]
Note 4 - Loans (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	4,400,000		4,400,000		3,700,000
Residential Mortgage [Member]
Note 4 - Loans (Details) [Line Items]
Mortgage Loans on Real Estate	10,000,000		10,000,000
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage	138,000		138,000		603,000
One-to-Four Family Mortgages [Member]
Note 4 - Loans (Details) [Line Items]
Mortgage Loans on Real Estate, Cost of Mortgages Sold	$ 600,000		$ 1,600,000
Unallocated Financing Receivables [Member]
Note 4 - Loans (Details) [Line Items]
Loans and Leases Receivable, Allowance					45,000
Commercial Real Estate Portfolio Segment [Member]
Note 4 - Loans (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts	1		1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,654,000		$ 1,654,000	$ 238,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	912,000		912,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Note 4 - Loans (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,500,000		3,500,000
Troubled Debt Restructuring [Member]
Note 4 - Loans (Details) [Line Items]
Loans and Leases Receivable, Allowance	$ 315,000		$ 315,000		$ 346,000