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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] | Employees and Directors [Member] Preferred Stock [Member] | Employees and Directors [Member] Common Stock [Member] | Employees and Directors [Member] Additional Paid-in Capital [Member] | Employees and Directors [Member] Retained Earnings [Member] | Employees and Directors [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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)
Conversion of Preferred Stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 75 | $ 0 | $ 75 |  |  |  |  |
Balance (in shares) at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 2,035 |  |  |
Balance at Mar. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,973 | $ 20 | 165,788 | (159,891) | 8,890
Balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 11,230 |  |  |
Balance at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,950 | $ 112 | 176,101 | (174,849) | 3,314
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (3,214) | (3,214)
Conversion of Preferred Stock to common stock (in shares) | (5) | 18,813 |  |  |  | 0 | 1,982 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock to common stock | $ (231) | $ 188 | $ 43 | $ 0 | $ 0 | $ (234) | $ 20 | $ 214 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  | 465
Adjustment of Series C Preferred Stock conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 380 | (380) | 0
Stock-based compensation expense related to employee and director stock awards |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 60 | $ 0 | $ 60 |  |  |  |  |
Balance (in shares) at Mar. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 32,025 |  |  |
Balance at Mar. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,485 | $ 320 | $ 176,798 | $ (178,443) | $ 160

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