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Note 12 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | 2022 |  |  | 2021 |
Cost of revenue |  | $ | 34 |  |  | $ | 30 |
Research and development |  |  | 57 |  |  |  | 7 |
Selling |  |  | 27 |  |  |  | 10 |
General and administrative |  |  | 317 |  |  |  | 268 |
Total stock-based compensation expense |  | $ | 435 |  |  | $ | 315 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Stock price |  | $ | 5.03 |
Exercise price |  | $ | 5.03 |
Dividend yield |  |  | 0 | %
Expected volatility |  |  | 68 | %
Risk-free interest rate |  |  | 3.09 | %
Expected life (in years) |  |  | 6 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Awards (in Shares) |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2020 |  |  | 417,000 |  |  | $ | 11.26 |
Granted |  |  | 333,500 |  |  |  | 4.13 |
Expired / cancelled |  |  | (132,000 | ) |  |  | 11.73 |
Exercised |  |  | - |  |  |  | - |
Outstanding at December 31, 2021 |  |  | 618,500 |  |  |  | 7.32 |
Granted |  |  | 198,500 |  |  |  | 5.04 |
Expired / cancelled |  |  | (144,000 | ) |  |  | 11.72 |
Exercised |  |  | - |  |  |  | - |
Outstanding at December 31, 2022 |  |  | 673,000 |  |  | $ | 5.70 |
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  |  |  |  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  |  |  |  | Average |  |  | Average |  |  |  |  |  |  |  |  |  |  | Average |  |  |  |  |
Exercise |  |  | Number |  |  | Remaining |  |  | Exercise |  |  | Intrinsic |  |  | Number |  |  | Exercise |  |  | Intrinsic |
Price Range |  |  | Outstanding |  |  | Contractual |  |  | Price |  |  | Value |  |  | Exercisable |  |  | Price |  |  | Value |
$ 4.00 | - | 7.00 |  |  |  | 533,000 |  |  |  | 8.6 |  |  | $ | 4.53 |  |  | $ | 492,765 |  |  |  | 125,500 |  |  | $ | 4.44 |  |  | $ | 111,375 |
$ 7.01 | - | 10.00 |  |  |  | 20,000 |  |  |  | 5.3 |  |  | $ | 8.07 |  |  | $ | - |  |  |  | 20,000 |  |  | $ | 8.07 |  |  | $ | - |
$ 10.01 | - | 12.00 |  |  |  | 120,000 |  |  |  | 4.2 |  |  | $ | 10.52 |  |  | $ | - |  |  |  | 120,000 |  |  | $ | 10.52 |  |  | $ | - |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average Grant |
|  | Shares of |  |  | Date Fair |
|  | Restricted Stock |  |  | Value |
Unvested outstanding at January 1, 2021 |  |  | - |  |  | $ | - |
Granted |  |  | 42,800 |  |  |  | 4.65 |
Vested |  |  | (36,000 | ) |  |  | 4.60 |
Forfeited or cancelled |  |  | (6,800 | ) |  |  | 4.90 |
Unvested outstanding at December 31, 2021 |  |  | - |  |  |  | - |
Granted |  |  | 32,000 |  |  |  | 5.02 |
Vested |  |  | (32,000 | ) |  |  | 5.02 |
Forfeited or cancelled |  |  | - |  |  |  | - |
Unvested outstanding at December 31, 2022 |  |  | - |  |  | $ | - |
|  |  |  |  |  | Weighted |
|  | Shares of |  |  | Average Grant |
|  | Restricted |  |  | Date Fair |
|  | Stock Units |  |  | Value |
Unvested outstanding at January 1, 2021 |  |  | 8,750 |  |  | $ | 5.00 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | (3,250 | ) |  |  | 5.29 |
Forfeited or cancelled |  |  | - |  |  |  | - |
Unvested outstanding at December 31, 2021 |  |  | 5,500 |  |  |  | 4.82 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | (5,500 | ) |  |  | 4.82 |
Forfeited or cancelled |  |  | - |  |  |  | - - |
Unvested outstanding at December 31, 2022 |  |  | - |  |  | $ | - |

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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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