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Note 5 - Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Annual Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 21, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Computed “statutory” benefit (provision), Amount | $ 1,274 |  | $ (33,941) | $ 10,731
Computed “statutory” benefit (provision), Percentage | 35.00% | 35.00% | 35.00% | 35.00%
Percentage depletion, Amount | $ 5,174 |  | $ 8,114 | $ 2,432
Percentage depletion, Percentage | 142.00% |  | (8.00%) | 8.00%
Change in valuation allowance, Amount | $ 24,464 |  | $ 11,336 | $ (84,951)
Change in valuation allowance, Percentage | 672.00% |  | (12.00%) | (277.00%)
Federal rate change, Amount | $ (37,546) |  |  |
Federal rate change, Percentage | (1031.00%) |  |  |
State taxes, net of federal taxes, Amount | $ 1,112 |  | $ (565) | $ (3,639)
State taxes, net of federal taxes, Percentage | 30.00% |  | 1.00% | (12.00%)
Foreign currency remeasurement of monetary assets and liabilities, Amount | $ (10,357) |  | $ (4,598) | $ 28,184
Foreign currency remeasurement of monetary assets and liabilities, Percentage | (284.00%) |  | 5.00% | 92.00%
Rate differential on foreign earnings, Amount | $ (1,438) |  | $ (6,853) | $ (4,746)
Rate differential on foreign earnings, Percentage | (39.00%) |  | 7.00% | (15.00%)
Compensation, Amount | $ (661) |  | $ (1,517) | $ (1,014)
Compensation, Percentage | (18.00%) |  | 1.00% | (3.00%)
Foreign withholding taxes, Amount | $ (278) |  |  |
Foreign withholding taxes, percentage | (8.00%) |  |  |
Expiration of U.S. foreign tax credits, Amount | $ (2,300) |  |  |
Expiration of U.S. foreign tax credits, percentage | (63.00%) |  |  |
Other, Amount | $ 677 |  | $ 596 | $ (3,307)
Other, Percentage | 18.00% |  | (1.00%) | (12.00%)
Total income tax provision | $ (19,879) |  | $ (27,428) | $ (56,310)
Total provision, Percentage | (546.00%) |  | 28.00% | (184.00%)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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