Note 12 - Postretirement Medical Benefits (Details) - 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, 2013
Postretirement Medical Benefits [Member]
Note 12 - Postretirement Medical Benefits (Details) - Incremental Effects from a One Percent Change in Assumed Health Care Cost [Line Items]
Effect on total of service and interest cost components of net periodic postretirement health care benefit cost	$ 252
Effect on total of service and interest cost components of net periodic postretirement health care benefit cost	(194)
Effect on accumulated postretirement benefit obligation	2,444
Effect on accumulated postretirement benefit obligation	$ (1,934)