Thank you, Bob. Fourth quarter 2015 end user net revenues were $7.7 million, or 97% of net revenues, compared to $8.6 million or 93% of net revenues in the third quarter. OEM net revenues were $219,000 or 3% of net revenues, down from $637,000 or 7% for the third quarter of 2015. Net revenues from markets outside of semiconductor test were $2.7 million, or 34% of net revenues, compared with $3.1 million, or 34% of net revenues in the third quarter.
The Company's fourth quarter gross margin was $3.6 million, or 46%, as compared with $4.3 million, or 47%, in the third quarter. The reduction in the gross margin was the result of less favorable absorption of our fixed manufacturing costs, which were relatively unchanged at $1.4 million, but as a percentage of revenues, increased from 16% in Q3 to 17% in Q4. Partially offsetting this increase was a slight reduction in our consolidated component material costs, which declined from 33.2% in the third quarter to 32.8% in the fourth quarter.
While our consolidated component material costs remained stable sequentially, we saw both increases and decreases in our product segments. Our Thermal Products segment followed the consolidated trend and saw a sequential decrease in its component material costs, declining from 31.1% in Q3 to 30.0% in Q4, while our Mechanical and Electrical Product segments both saw increases (with our Mechanical Products segment increasing from 40.3% to 41.0% sequentially and our Electrical Products segment increasing from 35.6% in Q3 to 36.2% in Q4. The changes in component material costs were driven by changes in both product and customer mix.
Selling expense was $1.3 million for the fourth quarter, compared to $1.4 million for the third quarter, a decrease of $22,000 or 2% sequentially. There was reduced spending on travel and advertising, which was partially offset by increased costs for salaries and benefits.
Engineering and product development expense was $905,000 for the fourth quarter compared to $1.0 million for the third quarter, a decrease of $136,000 or 13% sequentially. The reduction is primarily related to reduced spending on product development, and to a lesser extent, there were also reductions in patent legal expenses and third party product development costs.
General and administrative expense was unchanged at $1.5 million for both Q4 and Q3 and reflected a reduction in officer bonus accruals which was fully offset by increases in professional fees and travel expense.
Other income was $5,000 for Q4 compared to $6,000 for the third quarter.
We accrued an income tax benefit of $187,000 in the fourth quarter compared to $97,000 in income tax expense booked in the third quarter. Our effective tax rate was to 24% in the third quarter compared to (121%) in the fourth quarter. The tax benefit booked in Q4 was driven by the operating losses as well as accruing the full year impact of the R&D tax credit that was permanently enacted during the fourth quarter. At December 31, 2015, our deferred tax assets were $1.2 million and our remaining net loss carryforward was $1.5 million for domestic state (primarily California) and $190,000 for foreign related to our German operation.
Fourth quarter net income was $33,000 or $0.00 per diluted share, compared with third quarter net income of $310,000 or $0.03 per diluted share. Average shares outstanding were 10,498,000 at December 31. We initiated our stock buyback on December 1 and through December 31, 2015 we had repurchased 41,332 shares at a net cost of $155,000 or $3.74 per share. As of February 29, 2016 we had repurchased a cumulative total of 130,847 shares or just under 1% of our outstanding common stock at a net cost of $530,000 or $4.05 per share.
Amortization and depreciation expense was $178,000 for the fourth quarter and EBITDA was $15,000 for the fourth quarter, down from $580,000 in EBITDA for the third quarter.
Consolidated headcount at the end of December (which includes temporary staff) was 126, up one from the level we had at September 30. As Bob noted earlier in this call, we reduced the annual operating expenses of our new EMS segment through headcount reduction of 8 staff in early January 2016, reducing total headcount to 118. We incurred approximately $100,000 in severance costs associated with this headcount reduction, which was in addition to the headcount reduction of 5 staff in our Mechanical Products segment completed in July 2015.
I will now turn to our balance sheet.
Cash and cash equivalents at the end of the fourth quarter were $25.7 million, up $327,000 from September 30. We currently expect cash and cash equivalents to increase beginning in the second quarter through the end of 2016, excluding the impact of the 2015 Repurchase Plan and any potential major acquisition.
Accounts receivable decreased $1.1 million to $4.4 million at December 31, driven by the reduced level of shipments during the fourth quarter.
Inventory decreased slightly by $282,000 to $3.5 million at December 31.
Capital expenditures during the fourth quarter were $54,000, down from $160,000 in the third quarter, and represented additions to leased systems in our Thermal Products segment as well as new computer hardware.
Bob provided consolidated and segment revenue and booking data earlier in the call. The backlog at the end of December was $2.4 million, down from $3.0 million at the end of September.
In terms of our financial outlook, as noted in our earnings release, based upon the normal seasonality we see each year in our business, we expect that net revenue for the quarter ended March 31, 2016 will be in the range of $7.5 million to $8.5 million and that the net earnings will range from breakeven to a loss of $0.05 per diluted share. We currently expect that our Q1 2016 product mix will be less favorable than Q4 2015and that the first quarter gross margin will range from 42% to 45%.
Operator, that concludes our formal remarks. We can now take questions.