INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2015

INVESTMENTS

Summary of amortized cost, unrealized gains and estimated fair values of available-for-sale securities

	December 31,
	2015		2014
	(in thousands)
U.S. Treasury Bonds, stripped of interest, maturing 2020 and 2022, aggregate par value of $1.6 million and $1.6 million, respectively:
Amortized cost	$	1,138	$	1,069
Gross unrealized gains		310		353
Estimated fair value	$	1,448	$	1,422

Schedule of amortized cost and estimated fair values of available-for-sale securities, by contractual maturity

        The amortized cost and estimated fair values of available-for-sale securities, by contractual maturity at December 31, 2015, are shown below.

	Amortized cost		Estimated fair value
	(in thousands)
Due within one year	$	114	$	145
Due after one year through five years		546		685
Due after five years through ten years		478		618
Total	$	1,138	$	1,448