Note 23 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Revenue | $ 124 | $ 154 | $ 34 | $ 168 | $ 18 | $ 42 | $ 39 | $ 26 | $ 480 | $ 125 | $ 603 |
| Gross profit (loss) | (93) | (11) | 21 | 10 | (19) | (118) | (94) | 7 | (73) | (224) | 120 |
| Operating loss | (2,716) | (2,238) | (2,367) | (2,566) | (2,142) | (2,372) | (2,440) | (2,327) | (9,887) | (9,281) | (8,939) |
| Net loss and comprehensive loss | $ (4,948) | $ (3,802) | $ (824) | $ (9,178) | $ (1,522) | $ (1,230) | $ (2,085) | $ (2,480) | $ (18,752) | $ (7,317) | $ (6,558) |
| Basic and diluted net loss per common share (in dollars per share) | $ 0 | $ (0.01) | $ 0 | $ (0.02) | $ 0 | $ 0 | $ (0.01) | $ (0.01) | $ (0.03) | $ (0.02) | |