Net Income Per Share Computations (Schedule Of Earnings Per Share Reconciliation) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Net Income Per Share Computations [Abstract]
Net income (numerator) amounts used for basic and diluted per share computations:	$ 953,633	$ 813,059	$ 571,650	$ 388,680	$ 938,908	$ 623,306	$ 442,934	$ 406,007	$ 2,727,022	$ 2,411,155
Weighted average shares (denominator) of common stock outstanding:
Basic									4,227,862	4,180,547
Plus dilutive effect of stock options									12,718	14,406
Diluted									4,240,580	4,194,953
Net income per common share:
Basic	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.22	$ 0.15	$ 0.11	$ 0.10	$ 0.65	$ 0.58
Diluted	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.22	$ 0.15	$ 0.11	$ 0.10	$ 0.64	$ 0.57