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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Service cost	$ 154	$ 108	$ 308	$ 216
Interest cost	152	151	304	302
Amortization of transition obligation	26	26	52	52
Recognized prior service cost	64	64	128	128
Recognized net actuarial loss	14		28
Net periodic benefit cost	$ 410	$ 349	$ 820	$ 698