Note 5 - Commitments and Contingencies - Changes in Product Liability Included in Accrued Liabilities (Details)	3 Months Ended
Mar. 31, 2018 USD ($)
Balance at December 31, 2017	$ 291,000
Warranties issued during the period	18,000
Settlements made during the period	(211,000)
Changes in liability for pre-existing warranties during the period	(1,000)
Balance at March 31, 2018	$ 97,000

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03.15(5))
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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 (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties.

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

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