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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
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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%

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