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Note 9 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 201 9 |  |  | 201 8 |  |  | 201 9 |  |  | 201 8 |
Cost of revenues |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Selling expense |  |  | 4 |  |  |  | - |  |  |  | 4 |  |  |  | - |
Engineering and product development expense |  |  | 12 |  |  |  | 2 |  |  |  | 15 |  |  |  | 3 |
General and administrative expense |  |  | 197 |  |  |  | 169 |  |  |  | 377 |  |  |  | 289 |
|  | $ | 213 |  |  | $ | 171 |  |  | $ | 396 |  |  | $ | 292 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested shares outstanding, January 1, 2019 |  |  | 114,750 |  |  | $ | 6.92 |
Granted |  |  | 115,680 |  |  |  | 6.57 |
Vested |  |  | (43,724 | ) |  |  | 6.90 |
Forfeited |  |  | (12,325 | ) |  |  | 7.14 |
Unvested shares outstanding, June 30, 2019 |  |  | 174,381 |  |  |  | 6.68 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 9 |  |  | 201 8 |
Risk-free interest rate |  |  | 2.38 | % |  |  | 2.74 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Expected common stock market price volatility factor |  |  | .41 |  |  |  | .39 |
Weighted average expected life of stock options (years) |  |  | 6.25 |  |  |  | 6.25 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Options outstanding, January 1, 2019 (21,800 exercisable) |  |  | 264,400 |  |  | $ | 7.54 |
Granted |  |  | 239,160 |  |  |  | 6.32 |
Exercised |  |  | - |  |  |  | - |
Forfeited |  |  | (7,050 | ) |  |  | 8.45 |
Options outstanding, June 30, 2019 (84,550 exercisable) |  |  | 496,510 |  |  |  | 6.94 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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