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Note 9 - Stock-based Compensation - Allocation of Share-based Compensation Expense (Details) - Restricted Stock [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement, Expense | $ 213 | $ 171 | $ 396 | $ 292
Cost of Sales [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |
Selling and Marketing Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 4 |  | 4 |
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 12 | 2 | 15 | 3
General and Administrative Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | $ 197 | $ 169 | $ 377 | $ 289

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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