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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Sales: |  |  |  |
Total sales | $ 11,981 | $ 14,088 | $ 24,350 | $ 25,476
Cost of sales: |  |  |  |
Total cost of sales | 7,781 | 9,720 | 16,536 | 17,730
Gross profit | 4,200 | 4,368 | 7,814 | 7,746
Operating expenses: |  |  |  |
Engineering and development | 717 | 762 | 1,344 | 1,491
Selling, general and administrative | 3,507 | 3,727 | 6,890 | 6,913
Total operating expenses | 4,224 | 4,489 | 8,234 | 8,404
Operating loss | (24) | (121) | (420) | (658)
Other income (expense): |  |  |  |
Foreign exchange gain (loss) | 176 | (154) | 159 | (621)
Interest expense | (101) | (75) | (206) | (113)
Interest income | 126 | 133 | 271 | 231
Gain on forgiveness of debt |  |  |  | 2,196
Other income (expense), net | (16) | 93 | 3 | 102
Total other income (expense), net | 185 | (3) | 227 | 1,795
Income (loss) before income taxes | 161 | (124) | (193) | 1,137
Income tax expense | 5 | 723 | 17 | 833
Net income (loss) | 156 | (847) | (210) | 304
Net income (loss) attributable to common shareholders | $ 148 | $ (847) | $ (210) | $ 289
Net income (loss) per share - basic | $ 0.03 | $ (0.20) | $ (0.05) | $ 0.07
Weighted average shares outstanding - basic | 4,274 | 4,158 | 4,237 | 4,117
Net income (loss) per share - diluted | $ 0.03 | $ (0.20) | $ (0.05) | $ 0.07
Weighted average shares outstanding - diluted | 4,285 | 4,158 | 4,237 | 4,202
Product |  |  |  |
Sales: |  |  |  |
Total sales | $ 8,217 | $ 10,976 | $ 16,937 | $ 19,384
Cost of sales: |  |  |  |
Total cost of sales | 6,265 | 8,553 | 13,542 | 15,502
Services |  |  |  |
Sales: |  |  |  |
Total sales | 3,764 | 3,112 | 7,413 | 6,092
Cost of sales: |  |  |  |
Total cost of sales | $ 1,516 | $ 1,167 | $ 2,994 | $ 2,228

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