Fair Values Of Assets And Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Fair Values Of Assets And Liabilities [Abstract]

Schedule Of Marketable Securities

June 30, 2018	Total		Level 1		Level 2		Level 3
Bond mutual funds	$	7,919,754	$	7,919,754	$	0	$	0
Certificates of deposit	$	3,070,823	$	3,070,823	$	0	$	0
December 31, 2017	Total		Level 1		Level 2		Level 3
Bond mutual funds	$	8,109,242	$	8,109,242	$	0	$	0
Corporate bonds	$	248,335	$	248,335	$	0	$	0
Certificates of deposit	$	3,063,323	$	3,063,323	$	0	$	0

Schedule Of Estimated Fair Value Of Long-Term Obligations Included In Financial Statements

	Carrying Value		Fair Value Level 2
Long-term obligations (including current installments)	$	460,593	$	467,210