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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Dec. 31, 2015
Retained Earnings (Accumulated Deficit), Ending Balance | $ (86,361,000) | $ (72,450,000) |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | 5,358,000 | 12,689,000 | $ 21,352,000 |  | $ 3,557,000
Allowance for Doubtful Accounts Receivable, Current, Ending Balance | 9,000 | 6,000 |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 |  |  |  |
Cost of Goods and Services Sold, Total | $ 517,000 | 690,000 | 746,000 |  |
Standard Product Warranty, Term | 2 years |  |  |  |
Standard Product Warranty Accrual, Ending Balance | $ 0 | 0 |  |  |
Income Tax Examination, Penalties and Interest Accrued, Total | 0 |  |  |  |
Accounting Standards Update 2018-11 [Member] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 1,500,000 |
Operating Lease, Liability, Total |  |  |  | $ 1,600,000 |
Shipping and Handling [Member] |  |  |  |  |
Cost of Goods and Services Sold, Total | $ 6,000 | $ 5,000 | $ 7,000 |  |

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