Investments (Tables)

6 Months Ended

Jun. 30, 2018

Investments [Abstract]

Cost And Estimated Fair Value Of Investments

	Cost		Gross unrealized gain		Gross unrealized loss			Fair value
June 30, 2018
Commercial Paper	$	272	$	0	$	0		$	272
Treasury Bills		7,679		33		0			7,712
Equity Securities		54		0		(9	)		45
		8,005		33		(9	)		8,029
Less Cash Equivalents		272		0		0			272
Total Investments, June 30, 2018	$	7,733	$	33	$	(9	)	$	7,757
December 31, 2017
Commercial Paper	$	568	$	0	$	0		$	568
Treasury Bills		7,687		24		0			7,711
Equity Securities		54		0		(9	)		45
		8,309		24		(9	)		8,324
Less Cash Equivalents		568		0		0			568
Total Investments, December 31, 2017	$	7,741	$	24	$	(9	)	$	7,756