Note 4 - Loans and Allowance for Loan Losses (Detail) - Aging of the Recorded Investment of Past Due Loans (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Total	$ 551,274	$ 558,288
Residential Real Estate Loans [Member]
30-59 Days Past Due	3,275	5,525
60-89 Days Past Due	898	1,033
90 or More Days Past Due	3,096	2,797
Total Past Due	7,269	9,355
Loans Not Past Due	216,283	216,667
Total	223,552	226,022
Commercial Real Estate Owner Occupied [Member]
30-59 Days Past Due	816	753
60-89 Days Past Due	440	111
90 or More Days Past Due	675	675
Total Past Due	1,931	1,539
Loans Not Past Due	100,185	103,303
Total	102,116	104,842
Commercial Real Estate Nonowner Occupied [Member]
90 or More Days Past Due	52	352
Total Past Due	52	352
Loans Not Past Due	50,827	52,440
Total	50,879	52,792
Construction [Member]
Loans Not Past Due	19,270	17,376
Total	19,270	17,376
Commercial and Industrial [Member]
30-59 Days Past Due	180	202
Total Past Due	180	202
Loans Not Past Due	58,005	57,037
Total	58,185	57,239
Automobile Loans [Member]
30-59 Days Past Due	683	905
60-89 Days Past Due	145	138
90 or More Days Past Due	9	13
Total Past Due	837	1,056
Loans Not Past Due	39,236	40,112
Total	40,073	41,168
Home Equity Loans [Member]
30-59 Days Past Due	20	112
60-89 Days Past Due		37
90 or More Days Past Due	100	62
Total Past Due	120	211
Loans Not Past Due	18,031	18,121
Total	18,151	18,332
Other Consumer Loans [Member]
30-59 Days Past Due	752	1,066
60-89 Days Past Due	31	162
90 or More Days Past Due	5	7
Total Past Due	788	1,235
Loans Not Past Due	38,260	39,282
Total	39,048	40,517
Past Due Loans (Member)
30-59 Days Past Due	5,726	8,563
60-89 Days Past Due	1,514	1,481
90 or More Days Past Due	3,937	3,906
Total Past Due	11,177	13,950
Loans Not Past Due	540,097	544,338
Total	$ 551,274	$ 558,288