Note 10 - Postretirement Medical Benefits (Details) - The Following Disclosures of the Net Periodic Benefit Cost Components (Postretirement Medical Benefits [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Postretirement Medical Benefits [Member]
Note 10 - Postretirement Medical Benefits (Details) - The Following Disclosures of the Net Periodic Benefit Cost Components [Line Items]
Service cost	$ 158	$ 154	$ 315	$ 308
Interest cost	138	152	276	304
Amortization of transition obligation	0	26	0	52
Recognized prior service cost	64	64	128	128
Recognized net actuarial loss	0	14	0	28
Net periodic benefit cost	$ 360	$ 410	$ 719	$ 820