Note 8 - Stockholders' Equity (Tables)
|
9 Months Ended |
Sep. 30, 2022 |
|---|
| Notes Tables |
|
| Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
| |
|
Options |
|
| Outstanding at December 31, 2020 |
|
|
6,007,552 |
|
| Granted |
|
|
637,500 |
|
| Exercised |
|
|
— |
|
| Forfeited/canceled |
|
|
(272,029 |
) |
| Expired |
|
|
(126,557 |
) |
| Outstanding at December 31, 2021 |
|
|
6,246,466 |
|
| Granted |
|
|
1,195,000 |
|
| Exercised |
|
|
— |
|
| Forfeited/canceled |
|
|
(330,623 |
) |
| Expired |
|
|
(484,209 |
) |
| Outstanding at September 30, 2022 |
|
|
6,626,634 |
|
|
| Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| |
|
Nine Months Ended |
|
| |
|
September 30, |
|
| |
|
2022 |
|
|
2021 |
|
| Risk-free interest rate |
|
|
2.47 |
% |
|
|
1.00 |
% |
| Expected life (years) |
|
|
5.90 |
|
|
|
6.00 |
|
| Expected dividend yield |
|
|
— |
% |
|
|
— |
% |
| Expected volatility |
|
|
69.23 |
% |
|
|
73.99 |
% |
|
| Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
| |
|
Shares |
|
| Outstanding at December 31, 2020 |
|
|
1,436,728 |
|
| Awarded |
|
|
654,663 |
|
| Released |
|
|
— |
|
| Canceled/forfeited/expired |
|
|
(406,250 |
) |
| Outstanding at December 31, 2021 |
|
|
1,685,141 |
|
| Awarded |
|
|
197,688 |
|
| Released |
|
|
— |
|
| Canceled/forfeited/expired |
|
|
— |
|
| Outstanding at September 30, 2022 |
|
|
1,882,829 |
|
| |
|
|
|
|
| Expected to vest at September 30, 2022 |
|
|
1,882,829 |
|
| Vested at September 30, 2022 |
|
|
1,882,829 |
|
| Unvested at September 30, 2022 |
|
|
— |
|
| Unrecognized expense at September 30, 2022 |
|
$ |
— |
|
|
| Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
| |
|
Shares |
|
|
Weighted Average Exercise Price |
|
|
Weighted Average Remaining Contractual Term (Years) |
|
| Outstanding at December 31, 2020 |
|
|
2,691,459 |
|
|
$ |
1.99 |
|
|
|
2.94 |
|
| Granted |
|
|
580,231 |
|
|
$ |
— |
|
|
|
— |
|
| Exercised |
|
|
— |
|
|
$ |
— |
|
|
|
— |
|
| Canceled/forfeited/expired |
|
|
(25,000 |
) |
|
$ |
— |
|
|
|
— |
|
| Outstanding at December 31, 2021 |
|
|
3,246,690 |
|
|
$ |
2.26 |
|
|
|
3.59 |
|
| Granted |
|
|
5,928,261 |
|
|
$ |
— |
|
|
|
— |
|
| Exercised |
|
|
(3,188,190 |
) |
|
$ |
— |
|
|
|
— |
|
| Canceled/forfeited/expired |
|
|
— |
|
|
$ |
— |
|
|
|
— |
|
| Outstanding at September 30, 2022 |
|
|
5,986,761 |
|
|
$ |
2.72 |
|
|
|
2.02 |
|
|
| Restricted Stock Units (RSUs) [Member] |
|
| Notes Tables |
|
| Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
| |
|
Three Months Ended |
|
|
Nine Months Ended |
|
| |
|
September 30, |
|
|
September 30, |
|
| |
|
2022 |
|
|
2021 |
|
|
2022 |
|
|
2021 |
|
| General and administrative |
|
$ |
65,002 |
|
|
$ |
65,000 |
|
|
$ |
195,005 |
|
|
$ |
195,005 |
|
| Sales and marketing |
|
$ |
— |
|
|
$ |
56,635 |
|
|
$ |
— |
|
|
$ |
116,347 |
|
| |
|
$ |
65,002 |
|
|
$ |
121,635 |
|
|
$ |
195,005 |
|
|
$ |
311,352 |
|
|
| Stock Options and Warrants [Member] |
|
| Notes Tables |
|
| Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
| |
|
Three Months Ended |
|
|
Nine Months Ended |
|
| |
|
September 30, |
|
|
September 30, |
|
| |
|
2022 |
|
|
2021 |
|
|
2022 |
|
|
2021 |
|
| General and administrative |
|
$ |
65,800 |
|
|
$ |
62,684 |
|
|
$ |
571,462 |
|
|
$ |
226,572 |
|
| Sales and marketing |
|
|
20,972 |
|
|
|
19,522 |
|
|
|
56,183 |
|
|
|
83,335 |
|
| Engineering, research, and development |
|
|
41,185 |
|
|
|
43,861 |
|
|
|
171,734 |
|
|
|
130,519 |
|
| |
|
$ |
127,957 |
|
|
$ |
126,067 |
|
|
$ |
799,379 |
|
|
$ |
440,426 |
|
|