Note 9 - Postretirement Medical Benefits (Detail) - The Following Disclosures of the Net Periodic Benefit Cost Components (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Service cost	$ 155	$ 108	$ 463	$ 324
Interest cost	152	152	456	454
Amortization of transition obligation	24	24	76	76
Recognized prior service cost	65	65	193	193
Recognized net actuarial loss	14		42
Net periodic benefit cost	$ 410	$ 349	$ 1,230	$ 1,047