Note 12 - Postretirement Medical Benefits (Detail) - Incremental Effects from a One Percent Change in Assumed Health Care Cost (Postretirement Medical Benefits [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Postretirement Medical Benefits [Member]
Effect on total of service and interest cost components of net periodic postretirement health care benefit cost	$ 329
Effect on total of service and interest cost components of net periodic postretirement health care benefit cost	(249)
Effect on accumulated postretirement benefit obligation	3,374
Effect on accumulated postretirement benefit obligation	$ (2,632)