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Note 2 - Marketable Securities (Tables)

12 Months Ended

Dec. 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
December 31, 201 8
Available-for-sale securities:
Corporate bonds and notes		$	2,911			$	1			$	(31	)		$	2,881
Municipal bonds			1,849				—				(15	)			1,834
Total available-for-sale securities		$	4,760			$	1			$	(46	)		$	4,715

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				Estimated
		cost				fair value

Due within one year		$	955			$	951
Due after one year through five years			3,805				3,764
Total available-for-sale securities		$	4,760			$	4,715

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

		Less than 12 months								More than 12 months								Total
		Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses
As of December 31, 201 8
Corporate bonds and notes		$	—			$	—			$	2,881			$	31			$	2,881			$	31
Municipal bonds			—				—				1,834				15				1,834				15
		$	—			$	—			$	4,715			$	46			$	4,715			$	46