Note 3 - Loans (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Gross	$ 675,116,000	$ 676,190,000
Financing Receivable, Recorded Investment, Nonaccrual Status	7,029,000	12,116,000
Past Due 1-29 (Member)
Financing Receivable, Recorded Investment, Nonaccrual Status	1,100,000	1,200,000
Past Due 30-59 Days (Member)
Financing Receivable, Recorded Investment, Nonaccrual Status	183,000	3,400,000
Past Due 60-89 (Member)
Financing Receivable, Recorded Investment, Nonaccrual Status	199,000	421,000
Past Due 90 or more days (Member)
Financing Receivable, Recorded Investment, Nonaccrual Status	5,500,000	7,100,000
Demand Deposit Overdrafts (Member)
Financing Receivable, Gross	$ 220,000	$ 293,000