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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Sales: |  |  |  |
Total sales | $ 14,088 | $ 16,883 | $ 25,476 | $ 33,741
Cost of sales: |  |  |  |
Total cost of sales | 9,720 | 12,400 | 17,730 | 25,227
Gross profit | 4,368 | 4,483 | 7,746 | 8,514
Operating expenses: |  |  |  |
Engineering and development | 762 | 716 | 1,491 | 1,388
Selling, general and administrative | 3,727 | 3,910 | 6,913 | 7,671
Total operating expenses | 4,489 | 4,626 | 8,404 | 9,059
Operating loss | (121) | (143) | (658) | (545)
Other income (expense): |  |  |  |
Foreign exchange (loss) gain | (154) | 479 | (621) | 144
Interest expense | (75) | (55) | (113) | (112)
Interest income | 133 | 163 | 231 | 336
Gain on forgiveness of debt |  |  | 2,196 |
Other income (expense) | 93 | (7) | 102 | 4
Total other income (expense) | (3) | 580 | 1,795 | 372
(Loss) income before income taxes | (124) | 437 | 1,137 | (173)
Income tax expense | 723 | 1,169 | 833 | 1,099
Net (loss) income | (847) | (732) | 304 | (1,272)
Net (loss) income attributable to common stockholders | $ (847) | $ (732) | $ 289 | $ (1,272)
Net (loss) income per share – basic | $ (0.20) | $ (0.18) | $ 0.07 | $ (0.32)
Weighted average shares outstanding – basic (in Shares) | 4,158 | 4,036 | 4,117 | 3,999
Net (loss) income per share – diluted | $ (0.20) | $ (0.18) | $ 0.07 | $ (0.32)
Weighted average shares outstanding – diluted (in Shares) | 4,158 | 4,036 | 4,202 | 3,999
Product |  |  |  |
Sales: |  |  |  |
Total sales | $ 10,976 | $ 13,146 | $ 19,384 | $ 26,705
Cost of sales: |  |  |  |
Total cost of sales | 8,553 | 11,033 | 15,502 | 22,637
Service |  |  |  |
Sales: |  |  |  |
Total sales | 3,112 | 3,737 | 6,092 | 7,036
Cost of sales: |  |  |  |
Total cost of sales | $ 1,167 | $ 1,367 | $ 2,228 | $ 2,590

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