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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Retained Earnings
--- | --- | --- | --- | ---
Balance at Mar. 31, 2018 | $ 108,437 | $ 34,564 | $ (70,459) | $ 144,332
Balance (in shares) at Mar. 31, 2018 |  | 7,895 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of restricted stock awards (in shares) |  | 23 |  |
Exercise of stock options | 16 | $ 16 |  |
Exercise of stock options (in shares) |  | 12 |  |
Cancellation of restricted stock awards (in shares) |  | (22) |  |
Share-based compensation | 41 | $ 41 |  |
Net income (loss) | 1,097 |  |  | 1,097
Balance at Dec. 31, 2018 | 109,591 | $ 34,621 | (70,459) | 145,429
Balance (in shares) at Dec. 31, 2018 |  | 7,908 |  |
Balance at Sep. 30, 2018 | 110,464 | $ 34,589 | (70,459) | 146,334
Balance (in shares) at Sep. 30, 2018 |  | 7,904 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of restricted stock awards (in shares) |  | 6 |  |
Exercise of stock options | 5 | $ 5 |  |
Exercise of stock options (in shares) |  | 1 |  |
Cancellation of restricted stock awards (in shares) |  | (3) |  |
Share-based compensation | 27 | $ 27 |  |
Net income (loss) | (905) |  |  | (905)
Balance at Dec. 31, 2018 | 109,591 | $ 34,621 | (70,459) | 145,429
Balance (in shares) at Dec. 31, 2018 |  | 7,908 |  |
Balance at Mar. 31, 2019 | 104,885 | $ 34,660 | (70,459) | 140,684
Balance (in shares) at Mar. 31, 2019 |  | 7,910 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of restricted stock awards (in shares) |  | 39 |  |
Exercise of stock options | 5 | $ 5 |  |
Exercise of stock options (in shares) |  | 2 |  |
Cancellation of restricted stock awards (in shares) |  | (25) |  |
Share-based compensation | 148 | $ 148 |  |
Treasury stock repurchases | (216) |  | (216) |
Net income (loss) | 1,170 |  |  | 1,170
Balance at Dec. 31, 2019 | 105,992 | $ 34,813 | (70,675) | 141,854
Balance (in shares) at Dec. 31, 2019 |  | 7,926 |  |
Balance at Sep. 30, 2019 | 105,833 | $ 34,749 | (70,459) | 141,543
Balance (in shares) at Sep. 30, 2019 |  | 7,925 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options | 5 | $ 5 |  |
Exercise of stock options (in shares) |  | 1 |  |
Share-based compensation | 59 | $ 59 |  |
Treasury stock repurchases | (216) |  | (216) |
Net income (loss) | 311 |  |  | 311
Balance at Dec. 31, 2019 | $ 105,992 | $ 34,813 | $ (70,675) | $ 141,854
Balance (in shares) at Dec. 31, 2019 |  | 7,926 |  |

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