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Note 9 - Stock-based Compensation Expense (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Cost of revenue |  | $ | 9,221 |  |  | $ | 7,715 |  |  | $ | 26,100 |  |  | $ | 7,715 |
Research and development |  |  | 16,367 |  |  |  | 3,972 |  |  |  | 42,684 |  |  |  | 3,972 |
Selling and shipping |  |  | 7,508 |  |  |  | 4,371 |  |  |  | 18,305 |  |  |  | 4,371 |
General and administrative |  |  | 85,452 |  |  |  | 89,433 |  |  |  | 220,290 |  |  |  | 201,884 |
Total |  | $ | 118,548 |  |  | $ | 105,491 |  |  | $ | 307,379 |  |  | $ | 217,942 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
2007 Share Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Beginning |  |  | Granted |  |  | Exercised |  |  | Canceled |  |  | Ending |  |  |  |  |
|  | Balance |  |  | During |  |  | During |  |  | During |  |  | Balance |  |  |  |  |
|  | Outstanding |  |  | Period |  |  | Period |  |  | Period |  |  | Outstanding |  |  | Exercisable |
Number of shares |  |  | 220,000 |  |  |  | - |  |  |  | - |  |  |  | (75,000 | ) |  |  | 145,000 |  |  |  | 145,000 |
Weighted average exercise price per share |  | $ | 12.56 |  |  |  | - |  |  |  | - |  |  | $ | 15.00 |  |  | $ | 11.29 |  |  | $ | 11.29 |
2016 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Beginning |  |  | Granted |  |  | Exercised |  |  | Canceled |  |  | Ending |  |  |  |  |
|  | Balance |  |  | During |  |  | During |  |  | During |  |  | Balance |  |  |  |  |
|  | Outstanding |  |  | Period |  |  | Period |  |  | Period |  |  | Outstanding |  |  | Exercisable |
Number of shares |  |  | 398,500 |  |  |  | 102,500 |  |  |  | - |  |  |  | (44,000 | ) |  |  | 457,000 |  |  |  | 145,500 |
Weighted average exercise price per share |  | $ | 4.43 |  |  | $ | 4.97 |  |  |  | - |  |  | $ | 4.25 |  |  | $ | 4.56 |  |  | $ | 4.94 |
2022 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Beginning |  |  | Granted |  |  | Exercised |  |  | Canceled |  |  | Ending |  |  |  |  |
|  | Balance |  |  | During |  |  | During |  |  | During |  |  | Balance |  |  |  |  |
|  | Outstanding |  |  | Period |  |  | Period |  |  | Period |  |  | Outstanding |  |  | Exercisable |
Number of shares |  |  | - |  |  |  | 76,000 |  |  |  | - |  |  |  | - |  |  |  | 76,000 |  |  |  | - |
Weighted average exercise price per share |  |  | - |  |  | $ | 5.13 |  |  |  | - |  |  |  | - |  |  | $ | 5.13 |  |  |  | - |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Stock Price |  | $ | 5.04 |
Exercise Price |  | $ | 5.04 |
Dividend yield |  |  | 0 | %
Expected volatility |  |  | 68 | %
Risk-Free interest rate |  |  | 2.96 | %
Expected life (in years) |  |  | 6.00 |
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 |  |  |  | 513,000 |  |  |  | 8.8 |  |  | $ | 4.51 |  |  | $ | 249,645 |  |  |  | 125,500 |  |  | $ | 4.94 |  |  | $ | 67,905 |
$7.01 | - | 10.00 |  |  |  | 20,000 |  |  |  | 5.6 |  |  | $ | 8.07 |  |  | $ | 0 |  |  |  | 20,000 |  |  | $ | 8.07 |  |  | $ | 0 |
$10.01 | - | 12.00 |  |  |  | 120,000 |  |  |  | 4.5 |  |  | $ | 10.52 |  |  | $ | 0 |  |  |  | 120,000 |  |  | $ | 10.52 |  |  | $ | 0 |
$12.01 | - | 15.00 |  |  |  | 25,000 |  |  |  | .1 |  |  | $ | 15.00 |  |  | $ | 0 |  |  |  | 25,000 |  |  | $ | 15.00 |  |  | $ | 0 |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  | Shares of |  |  | Average Grant |
|  | Restricted |  |  | Date Fair |
|  | Stock Units |  |  | Value |
Unvested outstanding at December 31, 2021 |  |  | 5,500 |  |  | $ | 4.82 |
Granted |  |  | - |  |  | $ | - |
Vested |  |  | (5,500 | ) |  | $ | 4.82 |
Forfeited or cancelled |  |  | - |  |  | $ | - |
Unvested outstanding at September 30, 2022 |  |  | - |  |  | $ | - |

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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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