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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Sales: |  |  |  |
Sales | $ 16,095 | $ 16,350 | $ 32,667 | $ 35,330
Cost of sales: |  |  |  |
Total cost of sales | 11,612 | 12,604 | 24,153 | 27,235
Gross profit | 4,483 | 3,746 | 8,514 | 8,095
Operating expenses: |  |  |  |
Engineering and development | 716 | 781 | 1,388 | 1,526
Selling, general and administrative | 3,910 | 3,736 | 7,671 | 7,325
Total operating expenses | 4,626 | 4,517 | 9,059 | 8,851
Operating loss | (143) | (771) | (545) | (756)
Other income (expense): |  |  |  |
Foreign exchange gain (loss) | 479 | (37) | 144 | (30)
Interest expense | (55) | (22) | (112) | (49)
Interest income | 163 | 66 | 336 | 121
Other income (expense), net | (7) | 3 | 4 | 5
Total other income (expense) | 580 | 10 | 372 | 47
Income (loss) before income taxes | 437 | (761) | (173) | (709)
Income tax expense (benefit) | 1,169 | (142) | 1,099 | (140)
Net loss | (732) | (619) | (1,272) | (569)
Net loss attributable to common stockholders | $ (732) | $ (619) | $ (1,272) | $ (569)
Net loss per share - basic | $ (0.18) | $ (0.15) | $ (0.32) | $ (0.15)
Weighted average shares outstanding – basic (in Shares) | 4,036 | 4,015 | 3,999 | 3,898
Net loss per share - diluted | $ (0.18) | $ (0.15) | $ (0.32) | $ (0.15)
Weighted average shares outstanding – diluted (in Shares) | 4,036 | 4,015 | 3,999 | 3,898
Product |  |  |  |
Sales: |  |  |  |
Sales | $ 12,296 | $ 13,603 | $ 25,518 | $ 29,314
Cost of sales: |  |  |  |
Total cost of sales | 10,245 | 11,371 | 21,563 | 24,583
Service |  |  |  |
Sales: |  |  |  |
Sales | 3,799 | 2,747 | 7,149 | 6,016
Cost of sales: |  |  |  |
Total cost of sales | $ 1,367 | $ 1,233 | $ 2,590 | $ 2,652

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