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Stockholders' Equity (Narrative) (Details) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 08, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Stockholders' Equity |  |  |  |  |
Share-based compensation |  | $ 211,328 | $ 129,715 |  |
Class of Warrant or Right, Outstanding |  | 418,441 |  |  | 418,441
Restricted Stock [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Share-based compensation expense |  | $ 168,000 | 107,000 |  |
Unearned share-based compensation expense in future periods |  | $ 347,000 |  |  |
Unearned share-based compensation earn period |  | 2 years |  |  |
Stock Option [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Unearned share-based compensation expense in future periods |  | $ 374,000 |  |  |
Unearned share-based compensation earn period |  | 2 years |  |  |
Weighted average fair value of stock options grants (in dollars per share) |  | $ 1.12 |  |  |
Intrinsic value of options outstanding |  | $ 73,000 | 18,000 |  |
Intrinsic value of exercisable options |  | 1,000 | 11,000 |  |
Share-based compensation |  | $ 43,000 | $ 22,000 |  |
2006 and 2016 Equity Incentive Plans [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Common stock reserved for future issuances (in shares) |  | 873,180 |  |  |
2016 Equity Incentive Plan [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Common stock reserved for future issuances (in shares) |  | 465,984 |  |  |
Warrant [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Exercise price (in dollars per share) |  | $ 3.25 |  | $ 3.25 |
Common Stock [Member] | Warrant [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Expiration date |  | Jan. 17, 2023 |  |  |
February 2021 Public Offering [Member] | Common Stock [Member] |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Issued (in shares) | 14,950,000 |  |  |  |
Proceeds from issuance or sale of equity | $ 119,100,000 |  |  |  |

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