Thanks Bob. Second quarter 2016 end-user net revenues were $9.7 million or 93% of net revenues, compared to $8.2 million or 94% of net revenues in the third quarter. OEM net revenues were $770,000 or 7% of net revenues, up from $493,000 or 6% for the first quarter. Net revenues for markets outside of semiconductor tests were $2.5 million or 24% of net revenues, compared with $2.6 million or 30% of net revenues in the first quarter.
The company's second quarter gross margin was $5.3 million or 51%, as compared with $4.1 million or 47% in the first quarter. The improvement in the gross margin was primarily the result of both a decline in our fixed manufacturing costs, as well as a more favorable absorption of these manufacturing costs. Our fixed manufacturing costs declined by $95,000, or 7% sequentially, due to reduced salary and benefit costs, as well as lower levels of facility-related costs. This reduction accounted for approximately 25% of the gross margin improvement. The balance of the Q2 2016 gross margin improvement was the result of better absorption of our fixed manufacturing costs, due to the sequential growth in revenues, with our fixed manufacturing costs reducing from 16% of revenues in Q1 to 12% in Q2. Partially offsetting this decrease was a slight increase in our consolidated component material costs, which grew from 33.8% in the first quarter to 34.6% in the second quarter.
The increase in our consolidated component material costs was a result of an increase in our component material costs in our Thermal and Electrical Products segments. Our Thermal Products segment's component material costs increased from 30% in the first quarter to 32.4% in the second quarter, while our Electrical Products segment saw its component material costs increase from 33.2% to 36.8% sequentially. The increases were both the result of a less favorable product mix and customer mix in the second quarter as compared to the first.
These increases were partially offset by a reduction in our Mechanical Products segment's component material costs, which declined from 44.3% in the first quarter to 37.5% in the second quarter. The reduction in our Mechanical Products segment's Q2 component material costs was the result of a more favorable product mix, with lower margined manipulator products reducing from 43% of first quarter segment revenues to 27% of second quarter segment revenues.
Selling expense was $1.5 million for the second quarter, compared to $1.3 million in the first quarter, an increase of $136,000 or 10%. The increase was primarily driven by higher levels of commission expense resulting from the increased revenues. In addition, there were increased costs for advertising and travel.
Engineering and product development expense was $982,000 for the second quarter, compared to $991,000 for the first quarter, a decrease of just 1% sequentially. The decrease was related to reduced salary and benefit expense, which was partially offset by increases in product development costs in our thermal product segment, and increased patent costs in our Thermal and Mechanical Products segments.
General and administrative expense was $2.1 m mechanical products segment for the second quarter, compared to $1.6 million in the first quarter, an increase of $500,000 or 30%. As Bob previously noted, our second quarter G&A expense included $456,000 or $0.04 per diluted share in acquisition related expenses. First quarter general and administrative expense included $99,000 worth of restructuring costs related to a reduction of force completed in our mechanical products segment in early January. When adjusted to remove these items, second quarter G&A expenses increased $143,000 or 9% from the first quarter. This increase was the result of higher levels of stock based compensation expense related to restricted stock awards granted to our three independent directors, which fully vested upon their re-election to our board at our June 29, 2016 annual meeting.
Other income was $18,000 for the second quarter, compared to $28,000 for the first quarter. The reduction in other income is primarily the result of reduced foreign exchange translation gain in the second quarter, as compared to the first quarter.
We accrued an income tax expense of $263,000 in the second quarter, compared to $43,000 accrued in the first quarter, and our effective tax benefit was 35% in both quarters. At June 30, 2016 our deferred tax assets were $1.1 million and our remaining net loss carry-forward was $1.4 million for domestic, primarily California, and $2,016 for foreign related to our German operation. We expect our tax rate for the balance of 2016 to be in the range of 34 to 36%.
Second quarter net income was $486,000, or $0.05 per diluted share, compared with first quarter net income of $81,000 or $0.01 per diluted share. Diluted average shares outstanding were 10,311,000 at June 30. We initiated our stock buyback on December 1, and during the quarter ended June 30, 2016, we repurchased 76,037 shares at a net cost of $297,000 or $3.91 per share. As of June 30, 2016 we had repurchased a cumulative total of 232,059 shares or just over 2% of our outstanding common stock, at a net cost of $919,000 or $3.96 per share. We had suspended our stock buyback in May 2016 as we commenced significant due diligence on an acquisition opportunity that had been expected to close on August 1, 2016. We currently expect to resume repurchasing our shares upon the filing of our 10-Q on or about August 12, 2016(FN).
Amortization and depreciation expense was $144,000 for the second quarter, and EBITDA was $882,000 for the second quarter, up from $273,000 in EBITDA for the first quarter.
Consolidated headcount at the end of June, which includes temporary staff, was 117, and an increase of 2 from the level we had at March 31.
I'll now turn to our balance sheet. Cash and cash equivalents at the end of the first quarter were $25 million, up $52,000 from March 31. We currently expect cash and cash equivalents to increase for the balance of 2016, excluding the impact of any potential acquisition.
Accounts receivable increased by $1.4 million to $6.4 million at June 30, driven by higher levels of shipments during the second quarter.
Inventory decreased slightly by $140,000 to $3.3 million at June 30.
Capital expenditures during the second quarter were $126,000, up from $38,000 in the first quarter and represented new computer hardware related to a company-wide system upgrade, and additions to our leased product inventory in our German operation.
Bob provided consolidated and segment revenue and booking data earlier in the call, and the backlog at the end of June was $5.7 million, up from $3.5 million at the end of March.
In terms of our financial outlook, as noted in our earnings release, we expect that net revenue for the quarter ended September 30, 2016 will be in the range of $9.5 million to $10.5 million, and that net earnings will range from $0.03 to $0.07 per diluted share. We currently expect that our Q3 2016 product mix will be consistent with Q2, and that the third quarter gross margin will range from 48% to 51%.
Operator, that concludes our formal remarks. We can now take questions.