Note 5 - Accrued expenses and other current liabilities (Details) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Accrued employee liabilities	$ 5,122	$ 2,073
Accrued property, use, motor fuel and franchise taxes	1,005	1,472
Other	480	48
Total	$ 6,607	$ 3,593

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes.

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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