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Note 4 - Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2019

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
September 30, 2019
Available-for-sale securities:
Corporate bonds and notes		$	2,331			$	25			$	(4	)		$	2,352
Municipal bonds			1,520				11				—				1,531
Total available-for-sale securities		$	3,851			$	36			$	(4	)		$	3,883

December 31, 2018
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

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

		Amortized cost				Estimated fair value
Due within one year		$	1,639			$	1,640
Due after one year through five years			2,212				2,243
Due after five years			—				—
Total available-for-sale securities		$	3,851			$	3,883

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 September 30, 2019
Corporate bonds and notes		$	293			$	(4	)		$	101			$	—			$	394			$	(4	)
Municipal bonds			—				—				—				—				—				—
Total		$	293			$	(4	)		$	101			$	—			$	394			$	(4	)