Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

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Amount of decrease in the extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the extended product warranty. Excludes standard product warranties.

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase in the standard and extended product warranty accrual from warranties issued.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties.

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Note 5 - Balance Sheet Details (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Standard Product Warranty Accrual, Ending Balance	$ 4,406	$ 4,668	$ 3,640	$ 4,406	$ 3,640	$ 4,832	$ 3,561	$ 3,508
Standard Product Warranty Accrual, Decrease for Payments	1,930		$ 1,510	5,918	$ 6,032
Product Remediation Liability [Member]
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued, Total		5,000
Standard and Extended Product Warranty Accrual, Decrease for Payments, Total		1,100
Standard Product Warranty Accrual, Ending Balance	500	700		500
Extended Product Warranty Accrual, Ending Balance	$ 2,200	$ 3,200		2,200
Standard Product Warranty Accrual, Decrease for Payments				200
Extended Product Warranty Accrual, Decrease for Payments				$ 900