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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 43,999 |  | $ 323 | $ 61,505 | $ (17,829)
Balance (in shares) at Dec. 31, 2014 |  |  | 32,312,276 |  |
Issuance of common stock upon exercise of stock options and warrants | 460 |  | $ 5 | 455 | 0
Issuance of common stock upon exercise of stock options and warrants (in shares) |  |  | 482,506 |  |
Issuance of common stock for services | 30 |  | $ 0 | 30 | 0
Issuance of common stock for services (in shares) |  |  | 9,835 |  |
Value of share-based arrangements | 173 |  | $ 0 | 173 | 0
Value of share-based arrangements (in shares) |  |  | 0 |  |
Net income | 4,763 |  | $ 0 | 0 | 4,763
Balance at Dec. 31, 2015 | 49,425 |  | $ 328 | 62,163 | (13,066)
Balance (in shares) at Dec. 31, 2015 |  |  | 32,804,617 |  |
Sale of common stock | 48,356 |  | $ 74 | 48,282 | 0
Sale of common stock (in shares) |  |  | 7,392,856 |  |
Issuance of common stock upon exercise of stock options and warrants | 2,704 |  | $ 13 | 2,691 | 0
Issuance of common stock upon exercise of stock options and warrants (in shares) |  |  | 1,251,199 |  |
Excess tax benefits from exercise of stock options | 189 |  | $ 0 | 189 | 0
Issuance of common stock for services | 105 |  | $ 0 | 105 | 0
Issuance of common stock for services (in shares) |  |  | 17,148 |  |
Value of share-based arrangements | 601 |  | $ 0 | 601 | 0
Value of share-based arrangements (in shares) |  |  | 0 |  |
Net income | 10,637 | [1] | $ 0 | 0 | 10,637
Balance at Dec. 31, 2016 | 112,017 |  | $ 415 | 114,032 | (2,430)
Balance (in shares) at Dec. 31, 2016 |  |  | 41,465,820 |  |
Issuance of common stock upon exercise of stock options and warrants | 807 |  | $ 12 | 795 | 0
Issuance of common stock upon exercise of stock options and warrants (in shares) |  |  | 1,207,729 |  |
Tax withholdings related to net share settlements of stock option awards | (2,026) |  | $ (3) | (2,023) | 0
Tax withholdings related to net share settlements of stock option awards (in shares) |  |  | (281,645) |  |
Issuance of common stock for services | 47 |  | $ 0 | 47 | 0
Issuance of common stock for services (in shares) |  |  | 6,236 |  |
Value of share-based arrangements | 1,451 |  | $ 0 | 1,451 | 0
Value of share-based arrangements (in shares) |  |  | 0 |  |
Net income | 11,157 | [1] | $ 0 | 0 | 11,157
Balance at Dec. 31, 2017 | $ 123,453 |  | $ 424 | $ 114,302 | $ 8,727
Balance (in shares) at Dec. 31, 2017 |  |  | 42,398,140 |  |
[1] | The sum of the net earnings per share may not add up to the full year amount due to rounding and because the quarterly calculations are based on varying numbers of shares outstanding.

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