Net Income Per Share Computations (Schedule Of Earnings Per Share Reconciliation) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Net Income Per Share Computations [Abstract]
Net income (numerator) amounts used for basic and diluted per share computations:	$ 684,491	$ 925,837	$ 2,274,900	$ 310,752	$ 953,633	$ 813,059	$ 571,650	$ 388,680	$ 4,195,980	$ 2,727,022
Weighted average shares (denominator) of common stock outstanding:
Basic									4,287,142	4,227,862
Plus dilutive effect of stock options									23,371	12,718
Diluted									4,310,513	4,240,580
Net income per common share:
Basic	$ 0.16	$ 0.22	$ 0.53	$ 0.07	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.98	$ 0.65
Diluted	$ 0.16	$ 0.21	$ 0.53	$ 0.07	$ 0.22	$ 0.19	$ 0.14	$ 0.09	$ 0.97	$ 0.64