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Shareholders' Equity (Share Repurchases, Cumberland Emerging Technologies, Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | May 31, 2010
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common shares, value |  | $ 2,520,715 | $ 5,338,967 | $ 4,315,444 |  |
Exercise of options and related tax benefit |  |  |  | $ 1,000,005 |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  | 85.00% |
Payments to acquire interest in subsidiaries | $ 1,000,000 |  |  |  |  |
Loans Forgiven in Exchange For Share Issued, Amount | $ 2,400,000 |  |  |  |  |
Shares Repurchase, All, Except Settlement of Tax Liabilities Related to Exercise of Stock Options |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common shares, shares |  | (529,312) | (829,003) | (881,810) |  |
Repurchase of common shares, value |  | $ 2,500,000 | $ 5,300,000 | $ 4,300,000 |  |
Share Repurchase Program Authorized in 2010 |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Share repurchase program, number of shares authorized to be repurchased |  |  |  |  |  | $ 10,000,000

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- Definition Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569655-111683 + Details
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