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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Class A Common Stock | Class B Common Stock | Additional Paid-in Capital | Retained Earnings | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 67 | $ 9 | $ 64,795 | $ 156,689 | $ (36,561) | $ 184,999
Balance, shares at Dec. 31, 2018 | 6,732 | 923 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | 1,370 | 0 | 1,370
Dividends declared per common share | 0 | 0 | 0 | (1,784) | 0 | (1,784)
Compensation expense related to restricted stock awards | 0 | 0 | 559 | 0 | 0 | 559
Purchase of shares held in treasury | 0 | 0 | 0 | 0 | (80) | (80)
401(k) plan contribution | 0 | 0 | (113) | 0 | 375 | 262
Balance at Mar. 31, 2019 | $ 67 | $ 9 | 65,241 | 156,275 | (36,266) | 185,326
Balance, shares at Mar. 31, 2019 | 6,732 | 923 |  |  |  |
Balance at Dec. 31, 2018 | $ 67 | $ 9 | 64,795 | 156,689 | (36,561) | 184,999
Balance, shares at Dec. 31, 2018 | 6,732 | 923 |  |  |  |
Net income (loss) |  |  |  |  |  | 9,438
Balance at Sep. 30, 2019 | $ 67 | $ 9 | 66,338 | 160,778 | (36,789) | 190,403
Balance, shares at Sep. 30, 2019 | 6,730 | 923 |  |  |  |
Balance at Dec. 31, 2018 | $ 67 | $ 9 | 64,795 | 156,689 | (36,561) | 184,999
Balance, shares at Dec. 31, 2018 | 6,732 | 923 |  |  |  |
Issuance of restricted stock (in shares) | 29 | 44 |  |  |  |
Forfeiture of restricted stock (in shares) | (3) | 0 |  |  |  |
Balance at Dec. 31, 2019 | $ 68 | $ 9 | 66,811 | 162,822 | (37,358) | 192,352
Balance, shares at Dec. 31, 2019 | 6,771 | 954 |  |  |  |
Balance at Mar. 31, 2019 | $ 67 | $ 9 | 65,241 | 156,275 | (36,266) | 185,326
Balance, shares at Mar. 31, 2019 | 6,732 | 923 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | 4,734 | 0 | 4,734
Dividends declared per common share | 0 | 0 | 0 | (1,784) | 0 | (1,784)
Compensation expense related to restricted stock awards | 0 | 0 | 565 | 0 | 0 | 565
Purchase of shares held in treasury | 0 | 0 | 0 | 0 | (247) | (247)
Balance at Jun. 30, 2019 | $ 67 | $ 9 | 65,806 | 159,225 | (36,513) | 188,594
Balance, shares at Jun. 30, 2019 | 6,732 | 923 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | 3,334 | 0 | 3,334
Forfeiture of restricted stock | $ 0 | $ 0 | 0 | 0 | 0 | 0
Forfeiture of restricted stock (in shares) | (2) | 0 |  |  |  |
Dividends declared per common share | $ 0 | $ 0 | 0 | (1,781) | 0 | (1,781)
Compensation expense related to restricted stock awards | 0 | 0 | 532 | 0 | 0 | 532
Purchase of shares held in treasury | 0 | 0 | 0 | 0 | (276) | (276)
Balance at Sep. 30, 2019 | $ 67 | $ 9 | 66,338 | 160,778 | (36,789) | 190,403
Balance, shares at Sep. 30, 2019 | 6,730 | 923 |  |  |  |
Balance at Dec. 31, 2019 | $ 68 | $ 9 | 66,811 | 162,822 | (37,358) | 192,352
Balance, shares at Dec. 31, 2019 | 6,771 | 954 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | 1,680 | 0 | 1,680
Dividends declared per common share | 0 | 0 | 0 | (1,919) | 0 | (1,919)
Compensation expense related to restricted stock awards | 0 | 0 | 569 | 0 | 0 | 569
Purchase of shares held in treasury | 0 | 0 | 0 | 0 | (20) | (20)
401(k) plan contribution | 0 | 0 | (131) | 0 | 382 | 251
Balance at Mar. 31, 2020 | $ 68 | $ 9 | 67,249 | 162,583 | (36,996) | 192,913
Balance, shares at Mar. 31, 2020 | 6,771 | 954 |  |  |  |
Balance at Dec. 31, 2019 | $ 68 | $ 9 | 66,811 | 162,822 | (37,358) | 192,352
Balance, shares at Dec. 31, 2019 | 6,771 | 954 |  |  |  |
Net income (loss) |  |  |  |  |  | (4,181)
Forfeiture of restricted stock (in shares) | (2) | 0 |  |  |  |
Balance at Sep. 30, 2020 | $ 68 | $ 9 | 68,479 | 156,722 | (37,039) | 188,239
Balance, shares at Sep. 30, 2020 | 6,769 | 954 |  |  |  |
Balance at Mar. 31, 2020 | $ 68 | $ 9 | 67,249 | 162,583 | (36,996) | 192,913
Balance, shares at Mar. 31, 2020 | 6,771 | 954 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | (4,911) | 0 | (4,911)
Forfeiture of restricted stock | $ 0 | $ 0 | 0 | 0 | 0 | 0
Forfeiture of restricted stock (in shares) | (2) | 0 |  |  |  |
Compensation expense related to restricted stock awards | $ 0 | $ 0 | 612 | 0 | 0 | 612
Purchase of shares held in treasury | 0 | 0 | 0 | 0 | (21) | (21)
Balance at Jun. 30, 2020 | $ 68 | $ 9 | 67,861 | 157,672 | (37,017) | 188,593
Balance, shares at Jun. 30, 2020 | 6,769 | 954 |  |  |  |
Net income (loss) | $ 0 | $ 0 | 0 | (950) | 0 | (950)
Compensation expense related to restricted stock awards | 0 | 0 | 618 | 0 | 0 | 618
Purchase of shares held in treasury | 0 | 0 | 0 | 0 | (22) | (22)
Balance at Sep. 30, 2020 | $ 68 | $ 9 | $ 68,479 | $ 156,722 | $ (37,039) | $ 188,239
Balance, shares at Sep. 30, 2020 | 6,769 | 954 |  |  |  |

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