Investments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Fair Value of Available for Sale Securities

The following table summarizes the estimated fair value of investment securities designated as available for sale, classified by the contractual maturity date of the security as of December 31, 2018:

	Fair Value
Due within one year	$	394,000
Due one year through three years		1,501,000
Due after three years		2,630,000
	$	4,525,000

Schedule of Available for Sale Securities Reconciliation

The cost, gross unrealized gains (losses) and fair value of available for sale securities by major security type at December 31, 2018 and 2017 were as follows:

			Unrealized		Unrealized			Fair
December 31, 2018	Cost		Gain		Loss			Value
Investments - short term
U.S. Treasury Notes	$	302,000	$	1,000		-		$	303,000
Corporate bonds and commercial paper		91,000		-		-			91,000
Total investments - short term		393,000		1,000					394,000
Investments - long term
U.S. Treasury Notes		1,569,000		-		(2,000	)		1,567,000
Government agency bonds		1,548,000		-		(23,000	)		1,525,000
Corporate bonds		1,062,000		-		(23,000	)		1,039,000
Total investments - long term		4,179,000		-		(48,000	)		4,131,000
Total investments - available for sale	$	4,572,000	$	1,000	$	(48,000	)	$	4,525,000

			Unrealized		Unrealized			Fair
December 31, 2017	Cost		Gain		Loss			Value
Investments - short term
U.S. Treasury Notes	$	1,066,000		-		(1,000	)	$	1,065,000
Corporate bonds and commercial paper		136,000		-		-			136,000
Total investments - short term		1,202,000		-		(1,000	)		1,201,000
Investments - long term
U.S. Treasury Notes		3,367,000		-		(37,000	)		3,330,000
Government agency bonds		4,279,000		-		(40,000	)		4,239,000
Corporate bonds		2,744,000		-		(35,000	)		2,709,000
Total investments - long term		10,390,000		-		(112,000	)		10,278,000
Total investments - available for sale	$	11,592,000	$	-	$	(113,000	)	$	11,479,000