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Income Taxes - US Statutory Rate Reconciliation (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |
Federal income taxes at 34% statutory rate | $ 2,322,741 | $ 2,496,270
State and local taxes, net of federal income tax effect | 39,783 | 18,998
Permanent items | (370,978) | (25,077)
Transition tax on deemed repatriation of foreign earnings | 1,169,263 |
Effect of federal rate change on deferred taxes | 74,462 |
Foreign tax rate difference | (699,047) | (919,038)
Change in deferred income tax valuation allowance | (95,406) | 74,552
Provision for income taxes | $ 2,440,818 | $ 1,645,705

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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=84230637&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 + Details
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