Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - The resulting net periodic postretirement expense consisted of the following components for the year (Postretirement Plans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Postretirement Plans [Member]
Service cost	$ 400	$ 313	$ 271
Interest cost	217	207	210
Amortization of unrecognized (gain) loss	40		8
Amortization of past service (credit) liability	(85)	(85)	(85)
Net postretirement benefit expense	572	435	404
Current year actuarial (gain) loss	211	686	(141)
Amortization of actuarial gain	(40)		(8)
Amortization of prior service credit	85	85	85
Total recognized in other comprehensive income	256	771	(64)
Total recognized in net postretirement expense and other comprehensive income	$ 828	$ 1,206	$ 340