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Shareholders' Equity (Share Repurchases, Cumberland Emerging Technologies and Cumberland Foundation Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	May 31, 2010
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares, value	$ 1,025,836	$ 1,410,484
Amount available under current repurchase program	$ 3,800,000
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	367,793	438,359
Repurchase of common shares, value	$ 1,000,000	$ 1,400,000
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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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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