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Note 15 - Stock-based Compensation Plan (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Years Ended December 31, |
|  | 2021 |  |  | 2020 |
Cost of revenues |  | $ | 26 |  |  | $ | - |
Selling expense |  |  | 22 |  |  |  | 12 |
Engineering and product development expense |  |  | 62 |  |  |  | 42 |
General and administrative expense |  |  | 1,340 |  |  |  | 617 |
|  | $ | 1,450 |  |  | $ | 671 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2021 |  |  | 2020 |
Risk-free interest rate |  |  | 1.03 | % |  |  | 0.46 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Expected common stock market price volatility factor |  |  | .50 |  |  |  | .44 |
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 Exercise Price |
Options outstanding, January 1, 2020 |  |  | 506,810 |  |  |  | 6.89 |
Granted |  |  | 113,980 |  |  |  | 3.49 |
Exercised |  |  | - |  |  |  | - |
Canceled |  |  | (182,590 | ) |  |  | 6.31 |
Options outstanding, December 31, 2020 (204,630 exercisable) |  |  | 438,200 |  |  |  | 6.25 |
Granted |  |  | 282,404 |  |  |  | 11.77 |
Exercised |  |  | (231,185 | ) |  |  | 6.85 |
Canceled |  |  | (80,550 | ) |  |  | 9.55 |
Options outstanding, December 31, 2021 (59,195 exercisable) |  |  | 408,869 |  |  |  | 9.07 |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested shares outstanding, January 1, 2020 |  |  | 165,031 |  |  |  | 6.55 |
Granted |  |  | 229,110 |  |  |  | 4.24 |
Vested |  |  | (89,861 | ) |  |  | 5.32 |
Forfeited |  |  | (67,125 | ) |  |  | 6.03 |
Unvested shares outstanding, December 31, 2020 |  |  | 237,155 |  |  |  | 4.93 |
Granted |  |  | 131,209 |  |  |  | 11.74 |
Vested |  |  | (87,706 | ) |  |  | 7.59 |
Forfeited |  |  | (18,125 | ) |  |  | 9.02 |
Unvested shares outstanding, December 31, 2021 |  |  | 262,533 |  |  |  | 7.16 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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=122041274&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 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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