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Note 9 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 20 20 |  |  | 201 9 |
Cost of revenues |  | $ | - |  |  | $ | - |
Selling expense |  |  | 3 |  |  |  | - |
Engineering and product development expense |  |  | 10 |  |  |  | 3 |
General and administrative expense |  |  | 174 |  |  |  | 180 |
|  | $ | 187 |  |  | $ | 183 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested shares outstanding, January 1, 2020 |  |  | 165,031 |  |  | $ | 6.55 |
Granted |  |  | 58,160 |  |  |  | 3.69 |
Vested |  |  | (44,300 | ) |  |  | 5.42 |
Forfeited |  |  | (8,315 | ) |  |  | 6.10 |
Unvested shares outstanding, March 31, 2020 |  |  | 170,576 |  |  |  | 5.69 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 20 20 |  |  | 201 9 |
Risk-free interest rate |  |  | 0.48 | % |  |  | 2.49 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Expected common stock market price volatility factor |  |  | .43 |  |  |  | .41 |
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, 2020 (87,900 exercisable) |  |  | 506,810 |  |  | $ | 6.89 |
Granted |  |  | 66,300 |  |  |  | 3.69 |
Exercised |  |  | - |  |  |  | - |
Forfeited |  |  | (24,790 | ) |  |  | 6.10 |
Options outstanding, March 31, 2020 (172,525 exercisable) |  |  | 548,320 |  |  |  | 6.54 |

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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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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