Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) - Future Obligations Under Non-Cancelable Operating Leases (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future Obligations Under Non-Cancelable Operating Leases [Abstract]
2013	$ 3,087
2014	3,114
2015	1,434
2016	1,438
2017	1,056
Thereafter	3,848
Total	$ 13,977

Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details) - Future Obligations Under Non-Cancelable Operating Leases (USD $)
In Thousands, unless otherwise specified

Dec. 31, 2012

Future Obligations Under Non-Cancelable Operating Leases [Abstract]

$ 3,087

3,114

1,434

1,438

1,056

3,848

$ 13,977

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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