Note 4 - Loans (Details) - Loans by Type (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	$ 250,839	$ 245,289	$ 223,631
Financing receivable percentage of loan portfolio	100.00%	100.00%	100.00%
Construction and Land Development Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	11,542	11,995	17,293
Financing receivable percentage of loan portfolio	4.60%	4.90%	7.70%
Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	70,251	72,036	68,264
Financing receivable percentage of loan portfolio	28.00%	29.40%	30.50%
Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	74,261	69,145	64,484
Financing receivable percentage of loan portfolio	29.60%	28.20%	28.80%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	29,057	31,501	34,224
Financing receivable percentage of loan portfolio	11.60%	12.80%	15.30%
All Other Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	17,541	8,299	2,003
Financing receivable percentage of loan portfolio	7.00%	3.40%	0.90%
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	32,709	33,580	28,780
Financing receivable percentage of loan portfolio	13.10%	13.70%	12.90%
Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	7,455	14,252	3,119
Financing receivable percentage of loan portfolio	3.00%	5.80%	1.40%
Municipal Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	2,338	2,347	2,384
Financing receivable percentage of loan portfolio	0.90%	1.00%	1.10%
Finance Leases Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	841	1,057	1,722
Financing receivable percentage of loan portfolio	0.30%	0.40%	0.80%
Consumer Other Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable carrying amount (in Dollars)	$ 4,844	$ 1,077	$ 1,358
Financing receivable percentage of loan portfolio	1.90%	0.40%	0.60%