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Shareholders' Equity and Debt (Shareholders' Equity) (Details) - USD ($)	1 Months Ended	3 Months Ended						9 Months Ended
	Nov. 30, 2017	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Jan. 31, 2016	May 13, 2010
Shareholders' Equity (Textual) [Abstract]
Repurchase of shares, value		$ (237,616)	$ (484,965)	$ (303,088)	$ (332,504)	$ (769,648)	$ (441,624)
Shelf Registration, sale of corporate securities (up to)	$ 100,000,000
Restricted Stock
Shareholders' Equity (Textual) [Abstract]
Restricted stock granted in period, shares								36,850	230,491
Incentive Stock Options
Shareholders' Equity (Textual) [Abstract]
Restricted stock granted in period, shares								174,800
Director | Restricted Stock
Shareholders' Equity (Textual) [Abstract]
Restricted stock awards, vesting period								1 year
Common stock
Shareholders' Equity (Textual) [Abstract]
Repurchase outstanding common shares										$ 10,000,000	$ 10,000,000
Repurchase of shares (in shares)		76,408	158,405	91,724	101,354	141,463	164,866	326,537	407,683
Repurchase of shares, value		$ (237,616)	$ (484,965)	$ (303,088)	$ (332,504)	$ (769,648)	$ (441,624)	$ (1,000,000)	$ (1,500,000)
Common shares left to repurchase		$ 5,200,000						$ 5,200,000

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Shareholders Equity.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Amount of stock repurchase plan authorized.

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Amount remaining of a 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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