Note 9 - Income Taxes (Detail) - Income Tax Expense (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Currently payable	$ 3,953	$ 1,580	$ 5,429
Deferred	(1,043)	(2,227)	(3,392)
Total applicable to operations	2,910	(647)	2,037
Unfunded status of postretirement benefits	(92)	(500)	643
Net unrealized securities gains	214	3,593	(2,239)
Total income taxes	$ 3,032	$ 2,446	$ 441