Note 10 - Retirement Plans (Detail) - Changes in Supplemental Retirement Plans' Benefit Obligation (Retirement Plan [Member], USD $) In Thousands, unless otherwise specified					12 Months Ended
	Dec. 31, 2011 Beginning [Member]	Dec. 31, 2010 Beginning [Member]	Dec. 31, 2012 Ending [Member]	Dec. 31, 2011 Ending [Member]	Dec. 31, 2012	Dec. 31, 2011
Change in Benefit Obligation
Obligation at beginning of year	$ 706	$ 646	$ 741	$ 706
Service cost					26	22
Interest cost					29	32
Actuarial loss					8	33
Benefit payments					(28)	(27)
Obligation at end of year	$ 706	$ 646	$ 741	$ 706