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Note 15 - Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Quarterly Financial Information [Table Text Block] |
(in thousands, except per share data) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Quarter Ended |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
|  | 201 9 |  |  | 201 9 |  |  | 201 9 |  |  | 201 9 |
Revenues |  | $ | 109 |  |  | $ | 111 |  |  | $ | 110 |  |  | $ | 111 |
Gross profit |  |  | 109 |  |  |  | 111 |  |  |  | 110 |  |  |  | 111 |
Operating loss |  |  | (2,881 | ) |  |  | (3,240 | ) |  |  | (2,956 | ) |  |  | (2,912 | )
Net loss |  |  | (7,260 | ) |  |  | (7,476 | ) |  |  | (7,444 | ) |  |  | (7,348 | )
Basic and diluted net loss per common share |  | $ | (0.29 | ) |  | $ | (0.28 | ) |  | $ | (0.28 | ) |  | $ | (0.27 | )
|  | Quarter Ended |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
|  | 201 8 |  |  | 201 8 |  |  | 201 8 |  |  | 201 8 |
Revenues |  | $ | 108 |  |  | $ | 109 |  |  | $ | 112 |  |  | $ | 111 |
Gross profit (loss) |  |  | 108 |  |  |  | 109 |  |  |  | 112 |  |  |  | 111 |
Operating loss |  |  | (2,486 | ) |  |  | (2,255 | ) |  |  | (2,488 | ) |  |  | (3,992 | )
Net loss |  |  | (5,971 | ) |  |  | (6,032 | ) |  |  | (6,240 | ) |  |  | (8,030 | )
Basic and diluted net loss per common share |  | $ | (0.26 | ) |  |  | (0.25 | ) |  | $ | (0.26 | ) |  | $ | (0.33 | )

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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