Annual report pursuant to Section 13 and 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 ($)
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accrued liabilities $ 6,766,000 $ 4,623,000 $ 4,605,000
Other noncurrent liabilities 634,000 132,000 327,000
Accumulated deficit $ (155,385,000) (105,404,000) $ (105,581,000)
Accounting Standards Update 2014-09 [Member]      
Accrued liabilities [1]   18,000  
Other noncurrent liabilities [2]   (195,000)  
Accumulated deficit [3]   $ 177,000  
[1] Change relates to future costs associated with extended warranties required to be recorded on adoption of ASC 606.
[2] Change relates to long-term deferred revenue related to the extended warranties not required to be recorded under ASC 606.
[3] Change relates to cumulative effect adjustment upon adoption of ASC 606.