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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Conversion of Series B Preferred Stock to Common Stock [Member] Preferred Stock [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] Common Stock [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] Additional Paid-in Capital [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] Retained Earnings [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] Preferred Stock [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] Common Stock [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] Additional Paid-in Capital [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] Retained Earnings [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] | Series B Preferred Stock [Member] Preferred Stock [Member] | Series B Preferred Stock [Member] Common Stock [Member] | Series B Preferred Stock [Member] Additional Paid-in Capital [Member] | Series B Preferred Stock [Member] Retained Earnings [Member] | Series B Preferred Stock [Member] | Series C Preferred Stock [Member] Preferred Stock [Member] | Series C Preferred Stock [Member] Common Stock [Member] | Series C Preferred Stock [Member] Additional Paid-in Capital [Member] | Series C Preferred Stock [Member] Retained Earnings [Member] | Series C Preferred Stock [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 1,365 |  |  |  |
Balance (in shares) at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 1,365 |  |  |  |
Balance at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 680 | $ 13 | $ 151,365 | $ (141,887) | $ 10,171 |
Net Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (111) | (111) |
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 184 | 0 | 184 |
Conversion of Preferred Stock to common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) | 104 |  |  |  |
Conversion of Preferred Stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71 | $ 1 | 70 | 0 | 0 |
Reclassification of May 2023 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 7,502 | 0 | 7,502 |
Conversion of Preferred Stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (71) | (1) | (70) | 0 | 0 |
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 609 | $ 14 | 159,121 | (141,998) | 17,746 |
Balance (in shares) at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 1,365 |  |  |  |
Balance at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 680 | $ 13 | 151,365 | (141,887) | 10,171 |
Net Loss | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,402) |
Conversion of Preferred Stock to common stock |  |  |  |  |  | $ 110 |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock to common stock |  |  |  |  |  | (110) |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 570 | $ 18 | 163,142 | (149,946) | 13,784 |
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 | 1,469 |  |  |  |
Balance (in shares) at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 | 1,469 |  |  |  |
Balance at Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 609 | $ 14 | 159,121 | (141,998) | 17,746 |
Net Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (2,155) | (2,155) |
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 154 | 0 | 154 |
Conversion of Preferred Stock to common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) | 57 |  |  |  |
Conversion of Preferred Stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (39) | $ 1 | 38 | 0 | 0 |
Vesting of director restricted stock awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 3 |  |  |  |
Conversion of Preferred Stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39 | $ (1) | (38) | 0 | 0 |
Vesting of director restricted stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 |
Balance at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 570 | $ 15 | 159,313 | (144,153) | 15,745 |
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 1,529 |  |  |  |
Balance (in shares) at Jun. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 1,529 |  |  |  |
Net Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | (136) | (136) | [1]
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (208) | 0 | (208) |
Modification of common stock warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 1,922 | 0 | 1,922 |
Exercise of warrants, net of offering costs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 328 |  |  |  |
Exercise of warrants, net of offering costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 3 | 283 | 0 | 286 |
Reclassification of common stock warrants to liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (3,825) | 0 | (3,825) |
Adjustment of Series B Preferred Stock conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 5,657 | (5,657) | 0 |
Balance at Sep. 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 570 | $ 18 | 163,142 | (149,946) | 13,784 |
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 1,857 |  |  |  |
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 2,035 |  |  |  |
Balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 2,035 |  |  |  |
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,973 | $ 20 | 165,713 | (158,152) | 10,554 |
Net Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (1,739) | (1,739) |
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 75 | 0 | 75 |
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,973 | $ 20 | 165,788 | (159,891) | 8,890 |
Balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 2,035 |  |  |  |
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,973 | $ 20 | 165,713 | (158,152) | 10,554 |
Net Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,532) |
Conversion of Preferred Stock to common stock |  |  |  |  |  | 268 |  |  |  |  | 728 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock to common stock |  |  |  |  |  | (268) |  |  |  |  | (728) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,977 | $ 65 | 170,675 | (165,680) | 7,037 |
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 2,035 |  |  |  |
Balance (in shares) at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 2,035 |  |  |  |
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,973 | $ 20 | 165,788 | (159,891) | 8,890 |
Net Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (2,036) | (2,036) |
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 64 | 0 | 64 |
Conversion of Preferred Stock to common stock (in shares) |  | (3) | 1,897 |  |  |  | (1) | 277 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock to common stock |  | $ (121) | $ 19 | $ 102 | $ 0 | 0 | $ (728) | $ 2 | $ 726 | $ 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Modification of common stock warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 285 | 0 | 285 |
Adjustment of Preferred Stock conversion price |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,802 | $ (1,802) | $ 0 | $ 0 | $ 0 | $ 194 | $ (194) | $ 0 |  |  |  |  |  |
Reclassification of May 2023 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 1,360 | 0 | 1,360 |
Vesting of director restricted stock awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 5 |  |  |  |
Conversion of Preferred Stock to common stock |  | $ 121 | $ (19) | $ (102) | $ 0 | $ 0 | $ 728 | $ (2) | $ (726) | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,124 | $ 41 | 170,321 | (163,923) | 8,563 |
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 4,214 |  |  |  |
Balance (in shares) at Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 4,214 |  |  |  |
Net Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | (1,757) | (1,757) |
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 62 | 0 | 62 |
Conversion of Preferred Stock to common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) | 2,315 |  |  |  |
Conversion of Preferred Stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (147) | $ 24 | 123 | 0 | 0 |
Reclassification of derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 169 | 0 | 169 |
Conversion of Preferred Stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 147 | (24) | (123) | 0 | 0 |
Balance at Sep. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,977 | $ 65 | $ 170,675 | $ (165,680) | $ 7,037 |
Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 6,529 |  |  |  |
[1] | After giving retroactive effect to a 1-for-35 reverse stock split that became effective November 15, 2022.

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