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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Non-Controlling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 | $ 34 | $ 9,198 | $ (3,846) | $ 14,356 | $ (89) | $ 19,653
Balance (in shares) at Dec. 31, 2019 | 32,791,665 |  |  |  |  |
Exercised and vested stock-based awards |  | 221 |  |  |  | 221
Exercised and vested stock-based awards (in shares) | 385,917 |  |  |  |  |
Stock-based compensation expense |  | 497 |  |  |  | 497
Net income |  |  |  | 2,937 |  | 2,937
Balance at Mar. 31, 2020 | $ 34 | 9,916 | (3,846) | 17,293 | (89) | 23,308
Balance (in shares) at Mar. 31, 2020 | 33,177,582 |  |  |  |  |
Exercised and vested stock-based awards |  | 53 |  |  |  | 53
Exercised and vested stock-based awards (in shares) | 157,414 |  |  |  |  |
Stock-based compensation expense |  | 579 |  |  |  | 579
Net income |  |  |  | 3,017 |  | 3,017
Balance at Jun. 30, 2020 | $ 34 | 10,548 | (3,846) | 20,310 | $ (89) | 26,957
Balance (in shares) at Jun. 30, 2020 | 33,334,996 |  |  |  |  |
Balance at Dec. 31, 2020 | $ 36 | 37,235 | (3,846) | 23,430 |  | 56,855
Balance (in shares) at Dec. 31, 2020 | 34,791,931 |  |  |  |  |
Exercised and vested stock-based awards | $ 1 | 29 |  |  |  | 30
Exercised and vested stock-based awards (in shares) | 57,769 |  |  |  |  |
Stock-based compensation expense |  | 108 |  |  |  | 108
Shares of common stock withheld to pay taxes on employees' equity awards |  | (59) |  |  |  | (59)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares) | (3,758) |  |  |  |  |
Warrants exercised (in shares) | 8,848 |  |  |  |  |
Treasury stock |  |  | (75) |  |  | (75)
Treasury stock (in shares) | (5,000) |  |  |  |  |
Net income |  |  |  | (706) |  | (706)
Balance at Mar. 31, 2021 | $ 37 | 37,313 | (3,921) | 22,724 |  | 56,153
Balance (in shares) at Mar. 31, 2021 | 34,849,790 |  |  |  |  |
Balance at Dec. 31, 2020 | $ 36 | 37,235 | (3,846) | 23,430 |  | 56,855
Balance (in shares) at Dec. 31, 2020 | 34,791,931 |  |  |  |  |
Treasury stock | $ (2,100) |  |  |  |  |
Treasury stock (in shares) | (140,179) |  |  |  |  |
Balance at Jun. 30, 2021 | $ 37 | 37,697 | (5,966) | 25,532 |  | 57,300
Balance (in shares) at Jun. 30, 2021 | 34,767,899 |  |  |  |  |
Balance at Mar. 31, 2021 | $ 37 | 37,313 | (3,921) | 22,724 |  | 56,153
Balance (in shares) at Mar. 31, 2021 | 34,849,790 |  |  |  |  |
Exercised and vested stock-based awards |  | 59 |  |  |  | 59
Exercised and vested stock-based awards (in shares) | 85,190 |  |  |  |  |
Stock-based compensation expense |  | 401 |  |  |  | 401
Shares of common stock withheld to pay taxes on employees' equity awards |  | (76) |  |  |  | (76)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares) | (31,902) |  |  |  |  |
Treasury stock |  |  | (2,045) |  |  | (2,045)
Treasury stock (in shares) | (135,179) |  |  |  |  |
Net income |  |  |  | 2,808 |  | 2,808
Balance at Jun. 30, 2021 | $ 37 | $ 37,697 | $ (5,966) | $ 25,532 |  | $ 57,300
Balance (in shares) at Jun. 30, 2021 | 34,767,899 |  |  |  |  |

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