Investments (Tables)

12 Months Ended

Dec. 31, 2017

Investments [Abstract]

Schedule of cost and estimated fair value of investments

	Cost		Gross unrealized gain		Gross unrealized loss			Fair value
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
December 31, 2016
Commercial Paper	$	348	$	0	$	0		$	348
Treasury Bills		7,419		8		0			7,427
Equity Securities		54		0		(54	)		0
		7,821		8		(54	)		7,775
Less Cash Equivalents		348		0		0			348
Total Investments, December 31, 2016	$	7,473	$	8	$	(54	)	$	7,427

Schedule of realized gains and losses on investments

	Years Ended December 31,
	2017		2016
Gross Realized Gains	$	0	$	0
Gross Realized Losses		0		0
Net Realized Gain	$	0	$	0

Schedule Of Changes In Accumulated Other Comprehensive Income (Losses)

	December 31,
	2017		2016
Unrealized Gains (Losses)
Unrealized holding gains arising during the period	$	49	$	8
Less: Reclassification of gains included in net income		0		0
		49		8
Deferred Taxes on Unrealized Gains (Losses):
Increase in deferred taxes on unrealized gains arising during the period		8		4
Less: Reclassification of taxes on gains included in net income		0		0
		8		4
Net Change in Accumulated Other Comprehensive Income (Loss)	$	41	$	4