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Shareholders' Equity (Share Repurchases, Cumberland Emerging Technologies and Cumberland Foundation Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2015 | May 31, 2010
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common shares, value |  | $ 2,877,935 | $ 3,719,890 | $ 2,520,715 |  |
Exercise of options and related tax benefit |  |  |  | $ 1,000,000 |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  | 85.00% |
Payments to acquire interest in subsidiaries | $ 1,000,000.0 |  |  |  |  |
Loans Forgiven in Exchange For Share Issued, Amount | $ 2,400,000 |  |  |  |  |
Common stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Repurchase of common shares, shares |  | 443,041 | 547,376 | 529,312 |  |
Repurchase of common shares, value |  | $ 2,877,935 | $ 3,719,890 | $ 2,520,715 |  |
Charitable contribution of shares, shares |  |  | 50,000 |  |  |
Cumberland Emerging Technologies, Inc (CET) |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  | 80.00% |  |  |  |
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 |  | 443,041 | 547,376 | 529,312 |  |
Repurchase of common shares, value |  | $ 2,900,000 | $ 3,700,000 | $ 2,500,000 |  |
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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