Note 4 - Loans and Allowance for Loan Losses (Details) - Additional Information Regarding Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
With no related allowance recorded:
Total	$ 18,645	$ 15,551	$ 16,244	$ 14,130
Total	294	207	720	560
Total	294	207	720	560
Residential Portfolio Segment [Member]
With an allowance recorded:
Average Impaired Loans - With Allowance	412	552	416	487
Interest Income Recognized - With Allowance	5	17	22	25
Cash Basis Interest Recognized - With Allowance	5	17	22	25
With no related allowance recorded:
Average Impaired Loans - With No Allowance	971	611	749	544
Interest Income Recognized - With No Allowance	36	12	50	25
Cash Basis Interest Recognized - With No Allowance	36	12	50	25
Commercial Real Estate Owner Occupied [Member]
With an allowance recorded:
Average Impaired Loans - With Allowance		145		73
With no related allowance recorded:
Average Impaired Loans - With No Allowance	2,364	1,479	1,678	1,391
Interest Income Recognized - With No Allowance	61	9	91	31
Cash Basis Interest Recognized - With No Allowance	61	9	91	31
Commercial Real Estate Nonowner Occupied [Member]
With an allowance recorded:
Average Impaired Loans - With Allowance	3,299	3,422	3,321	3,439
Interest Income Recognized - With Allowance	18	41	92	94
Cash Basis Interest Recognized - With Allowance	18	41	92	94
With no related allowance recorded:
Average Impaired Loans - With No Allowance	5,620	5,974	5,669	6,513
Interest Income Recognized - With No Allowance	76	81	227	267
Cash Basis Interest Recognized - With No Allowance	76	81	227	267
Commercial and Industrial [Member]
With an allowance recorded:
Average Impaired Loans - With Allowance	2,299	3,259	2,462	1,629
Interest Income Recognized - With Allowance	26	39	83	107
Cash Basis Interest Recognized - With Allowance	26	39	83	107
With no related allowance recorded:
Average Impaired Loans - With No Allowance	3,462		1,731
Interest Income Recognized - With No Allowance	71		150
Cash Basis Interest Recognized - With No Allowance	71		150
Home Equity Loans [Member]
With an allowance recorded:
Average Impaired Loans - With Allowance	218	109	218	54
Interest Income Recognized - With Allowance	1	8	5	8
Cash Basis Interest Recognized - With Allowance	1	8	5	8
With no related allowance recorded:
Interest Income Recognized - With No Allowance				3
Cash Basis Interest Recognized - With No Allowance				$ 3