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Note 14 - Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | NOTE 14 – QUARTERLY FINANCIAL INFORMATION (UNAUDITED )
(in thousands, except per share data) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 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 |  |  | 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 | )
|  | Quarter Ended |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
|  | 2017 |  |  | 201 7 |  |  | 201 7 |  |  | 201 7 |
Revenues |  | $ | 108 |  |  | $ | 108 |  |  | $ | 111 |  |  | $ | 110 |
Gross profit (loss) |  |  | 108 |  |  |  | 108 |  |  |  | 111 |  |  |  | 110 | )
Operating loss |  |  | (4,113 | ) |  |  | (2,105 | ) |  |  | (2,414 | ) |  |  | (4,008 | )
Net loss |  |  | (7,227 | ) |  |  | (13,570 | ) |  |  | (5,992 | ) |  |  | (7,075 | )
Basic and diluted net loss per common share |  | $ | (0.33 | ) |  |  | (0.60 | ) |  | $ | (0.26 | ) |  | $ | (0.31 | )

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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