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Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Net sales | $ 42,644 | $ 51,399 | $ 90,921 | $ 98,726
Cost of sales | 32,695 | 37,028 | 68,148 | 71,859
Gross profit | 9,949 | 14,371 | 22,773 | 26,867
Selling, general & administrative expenses | 6,665 | 7,799 | 14,417 | 15,043
Loss on sale of fixed assets | 290 | 0 | 286 | 0
Operating income | 2,994 | 6,572 | 8,070 | 11,824
Interest expense | 33 | 194 | 49 | 425
Other expense | 35 | 198 | 362 | 437
Income before income tax expense | 2,926 | 6,180 | 7,659 | 10,962
Income tax expense | 608 | 1,582 | 1,450 | 2,630
Net income | $ 2,318 | $ 4,598 | $ 6,209 | $ 8,332
Net income per share: |  |  |  |
Basic (in dollars per share) | $ 0.31 | $ 0.62 | $ 0.83 | $ 1.12
Diluted (in dollars per share) | $ 0.31 | $ 0.62 | $ 0.82 | $ 1.11
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 7,487 | 7,423 | 7,472 | 7,413
Diluted (in shares) | 7,532 | 7,467 | 7,545 | 7,473

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