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13. Income Taxes (Details 3) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |
Computed expected tax provision (benefit) | $ (353,872) | $ (293,486)
State taxes | (21,754) | (32,283)
Foreign taxes | 37,371 | 91,072
Non-deductible items | 3,263 | 0
Percentage depletion | (40,976) | 0
Change in valuation allowance U.S. | 151,745 | (311,732)
Change in valuation allowance Foreign | 224,223 | 546,429
Foreign tax assessment | 285,048 | 0
Alternative minimum tax - Domestic | 13,090 | 0
Income tax (expense) | $ 298,138 | $ 0

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- Definition Amount 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 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 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)) -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 -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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