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Note 5 - Income Taxes (Details) - Reconciliation of Statutory Federal Income Tax Rate to Annual Tax Provision (Benefit) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Statutory Federal Income Tax Rate to Annual Tax Provision (Benefit) [Abstract]      
Computed “statutory” benefit (provision) $ 10,731 $ (4,405) $ 12,224
Computed “statutory” benefit (provision) 35.00% 35.00% 35.00%
Percentage depletion $ 2,432 $ 6,034 $ 3,946
Percentage depletion 8.00% (48.00%) 11.00%
Change in valuation allowance other than utilization $ (84,951) $ (6,314) $ (3,870)
Change in valuation allowance other than utilization (277.00%) 50.00% (11.00%)
State taxes, net of federal taxes $ (3,639) $ 1,671 $ 720
State taxes, net of federal taxes (12.00%) (13.00%) 2.00%
Transaction costs $ (270)   $ (1,743)
Transaction costs (1.00%)   (5.00%)
Foreign currency translation of monetary assets $ 28,184 $ 16,368 $ 3,445
Foreign currency translation of monetary assets 92.00% (130.00%) 10.00%
Rate differential on foreign earnings $ (4,746) $ (5,938) $ (4,255)
Rate differential on foreign earnings (15.00%) 47.00% (12.00%)
Compensation $ (815) $ (1,308) $ (326)
Compensation (3.00%) 10.00% (1.00%)
Other $ (3,236) $ (868) $ (346)
Other (11.00%) 7.00% (1.00%)
$ (56,310) $ 5,240 $ 9,795
(184.00%) (42.00%) 28.00%