Note 4 - Loans (Detail) - Loans by Type (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing receivable carrying amount (in Dollars)	$ 245,490	$ 245,289	$ 225,970
Financing receivable percentage of loan portfolio	100.00%	100.00%	100.00%
Construction and Land Development Loans [Member]
Financing receivable carrying amount (in Dollars)	12,711	11,995	18,087
Financing receivable percentage of loan portfolio	5.20%	4.90%	8.00%
Commercial Real Estate Owner Occupied [Member]
Financing receivable carrying amount (in Dollars)	67,824	72,036	70,894
Financing receivable percentage of loan portfolio	27.60%	29.40%	31.40%
Commercial Real Estate Non Owner Occupied [Member]
Financing receivable carrying amount (in Dollars)	68,992	69,145	60,302
Financing receivable percentage of loan portfolio	28.10%	28.20%	26.70%
Residential Real Estate Loans [Member]
Financing receivable carrying amount (in Dollars)	30,795	31,501	33,012
Financing receivable percentage of loan portfolio	12.40%	12.80%	14.60%
All Other Real Estate Loans [Member]
Financing receivable carrying amount (in Dollars)	12,686	8,299	2,014
Financing receivable percentage of loan portfolio	5.20%	3.40%	0.90%
Commercial and Industrial Loans [Member]
Financing receivable carrying amount (in Dollars)	29,955	33,580	26,019
Financing receivable percentage of loan portfolio	12.20%	13.70%	11.50%
Agricultural Loans [Member]
Financing receivable carrying amount (in Dollars)	16,089	14,252	9,524
Financing receivable percentage of loan portfolio	6.60%	5.80%	4.20%
Municipal Loans [Member]
Financing receivable carrying amount (in Dollars)	2,342	2,347	2,388
Financing receivable percentage of loan portfolio	1.00%	1.00%	1.10%
Finance Leases Financing Receivable [Member]
Financing receivable carrying amount (in Dollars)	976	1,057	1,835
Financing receivable percentage of loan portfolio	0.40%	0.40%	0.80%
Consumer Other Financing Receivable [Member]
Financing receivable carrying amount (in Dollars)	$ 3,120	$ 1,077	$ 1,895
Financing receivable percentage of loan portfolio	1.30%	0.40%	0.80%