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Note 4 - Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

		Amortized cost				Gross unrealized holding gains				Gross unrealized holding losses				Estimated fair value
March 31, 2018
Available-for-sale securities:
Corporate bonds and notes		$	6,040			$	5			$	(73	)		$	5,972
Municipal bonds			4,613				0				(37	)			4,576
Total available-for-sale securities		$	10,653			$	5			$	(110	)		$	10,548

		Amortized cost				Gross unrealized holding gains				Gross unrealized holding losses				Estimated fair value
December 31, 201 7
Available-for-sale securities:
Corporate bonds and notes		$	8,458			$	19			$	(49	)		$	8,428
Municipal bonds			4,637				1				(28	)			4,610
Total available-for-sale securities		$	13,095			$	20			$	(77	)		$	13,038

Available-for-sale Securities, Debt Maturities [Table Text Block]

		Amortized cost				Estimated fair value
March 31, 2018
Due within one year		$	3,145			$	3,132
Due after one year through five years			7,508				7,416
Total available-for-sale securities		$	10,653			$	10,548

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

		Less than 12 months								More than 12 months								Total
(In thousands)		Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses
As of March 31, 2018
Corporate bonds and notes		$	3,106			$	(30	)		$	2,282			$	(43	)		$	5,388			$	(73	)
Municipal bonds			3,197				(28	)			670				(9	)			3,867				(37	)
Total		$	6,303			$	(58	)		$	2,952			$	(52	)		$	9,255			$	(110	)