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Stock-Based Compensation Plans (Schedule of Share-Based Compensation Expense) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 1,364,698	$ 1,115,063	$ 852,102
Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1,244,606	1,032,094	833,027
Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	120,092	82,969	19,075
Foundation Contribution
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	0	372,500	0
Employee, Nonemployee and Foundation Contribution
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 1,364,698	$ 1,487,563	$ 852,102

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Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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-Topic 505
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