Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Balance Sheet (Details)

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Note 2 - Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for New Accounting Pronouncements on Consolidated Balance Sheet (Details) - USD ($)
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
[1]
Liabilities      
Accrued liabilities $ 5,125,000 $ 4,623,000 $ 4,605,000
Other noncurrent liabilities 394,000 132,000 327,000
Equity      
Accumulated deficit $ (141,893,000) (105,404,000) $ (105,581,000)
Accounting Standards Update 2014-09 [Member]      
Liabilities      
Accrued liabilities [2]   18,000  
Other noncurrent liabilities [3]   (195,000)  
Equity      
Accumulated deficit [4]   $ 177,000  
[1] The condensed consolidated balance sheet as of December 31, 2017 has been derived from the audited consolidated financial statements as of that date.
[2] Change relates to future costs associated with extended warranties required to be recorded on adoption of ASC 606.
[3] Change relates to long-term deferred revenue related to the extended warranties not required to be recorded under ASC 606.
[4] Change relates to cumulative effect adjustment upon adoption of ASC 606.