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Share-based Compensation, Charitable Contribution of Shares, Shares

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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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