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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2016

Marketable Securities [Abstract]

Schedule of marketable securities

					December 31,
			Maturity year		2 0 1 6				2 0 1 5
					U.S. dollars in thousands
	Short-term (a):
	Municipal bond				$	4,117			$	4,446
	Corporate bond					667				705
					$	4,784			$	5,151
	Long-term - security bond (b)		Perpetual		$	832			$	1,441

a. The Company invests in highly-rated marketable securities, and its policy limits the amount of credit exposure to any one issuer. The Company’s investment policy requires investments to be investment grade, rated single -A or better, with the objective of minimizing the potential risk of principal loss. Fair values were determined for each individual security in the investment portfolio based on quoted prices in active markets.

b. As of December 31, 2016 the Company held a long-term security bond which is classified as available-for-sale security and is presented on its fair value. The fair value of the available-for-sale security based on quoted prices in active markets for identical instruments (Level 1 as defined under ASC 820).

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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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