Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment - USD ($)	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Individually evaluated for impairment - loans	$ 6,844,000		$ 2,408,000
Collectively evaluated for imparment - loans	2,096,045,000		1,802,411,000
Ending balance - loans	2,102,889,000		1,804,819,000
Individually evaluated for impairment - allowance	446,000		60,000
Collectively evaluated for imparment - allowance	25,074,000		23,161,000
Ending balance - allowance	25,520,000	$ 24,491,000	23,221,000	$ 22,209,000	$ 21,140,000	$ 20,848,000
Commercial Portfolio Segment [Member]
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Individually evaluated for impairment - loans	71,000		16,000
Collectively evaluated for imparment - loans	85,269,000		77,124,000
Ending balance - loans	85,340,000		77,140,000
Individually evaluated for impairment - allowance	57,000
Collectively evaluated for imparment - allowance	848,000		838,000
Ending balance - allowance	905,000	986,000	838,000	837,000	761,000	808,000
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Individually evaluated for impairment - loans	1,883,000		303,000
Collectively evaluated for imparment - loans	554,235,000		528,790,000
Ending balance - loans	556,118,000		529,093,000
Collectively evaluated for imparment - allowance	6,815,000		7,207,000
Ending balance - allowance	6,815,000	7,030,000	7,207,000	6,943,000	6,920,000	7,348,000
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member]
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Collectively evaluated for imparment - loans	296,452,000		222,537,000
Ending balance - loans	296,452,000		222,537,000
Collectively evaluated for imparment - allowance	2,863,000		2,340,000
Ending balance - allowance	2,863,000	2,263,000	2,340,000	2,073,000	1,802,000	1,501,000
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Loan [Member]
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Individually evaluated for impairment - loans	602,000		630,000
Collectively evaluated for imparment - loans	101,199,000		106,715,000
Ending balance - loans	101,801,000		107,345,000
Individually evaluated for impairment - allowance				40,000
Collectively evaluated for imparment - allowance	949,000		1,023,000
Ending balance - allowance	949,000	1,007,000	1,023,000	1,014,000	1,148,000	1,191,000
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Individually evaluated for impairment - loans	3,716,000		1,083,000
Collectively evaluated for imparment - loans	968,807,000		778,911,000
Ending balance - loans	972,523,000		779,994,000
Individually evaluated for impairment - allowance	389,000		60,000
Collectively evaluated for imparment - allowance	12,538,000		10,539,000
Ending balance - allowance	12,927,000	12,114,000	10,599,000	10,040,000	9,180,000	8,607,000
Residential Portfolio Segment [Member] | Revolving Home Equity Line [Member]
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Individually evaluated for impairment - loans	572,000		376,000
Collectively evaluated for imparment - loans	84,234,000		82,733,000
Ending balance - loans	84,806,000		83,109,000
Collectively evaluated for imparment - allowance	968,000		1,121,000
Ending balance - allowance	968,000	1,021,000	1,121,000	1,187,000	1,207,000	1,240,000
Consumer and Other Porfolio Segment [Member]
Note 4 - Loans (Details) - Loans Individually and Collectively Evaluated for Impairment [Line Items]
Collectively evaluated for imparment - loans	5,849,000		5,601,000
Ending balance - loans	5,849,000		5,601,000
Collectively evaluated for imparment - allowance	93,000		93,000
Ending balance - allowance	$ 93,000	$ 70,000	$ 93,000	$ 115,000	$ 122,000	$ 153,000