Thank you, Bob. Net revenues for the quarter ended June 30, 2011, of $13.8 million increased 18% over the first quarter net revenues of $11.7 million and decreased 10% as compared with the second quarter 2010 net revenues of $15.3 million. Second quarter end user net revenues were $11.8 million, or 86% of net revenues, compared with first quarter end user net revenues of $10.1 million, or 86% of net revenues. OEM net revenues were $11.8 million, or 14% of net revenues, compared with first quarter OEM net revenues of $1.6 million, or 14% of net revenues. Net revenues for markets outside of semiconductor tests were $2.6 million, or 19% of net revenues, compared with $2.3 million, or 20% of net revenues in the first quarter.
On a product segment basis, first quarter net revenues for the mechanical products segment were $5.1 million, or 37% of net revenues, as compared with first quarter mechanical net revenues of $5.0 million, or 43% of net revenue. Our thermal product segment had net revenues of $6.7 million, or 49% of net revenues, as compared with first quarter net revenues of $5.4 million, or 46% of net revenues. Finally, our electrical products segment reported net revenues of $2.0 million, or 14% of net revenues, compared with first quarter net revenues of $1.3 million, or 11% of net revenues.
The company's overall net gross margin for the second quarter was $6.8 million, or 49%, as compared to with $5.1 million, or 44%, in the first quarter of 2011, and $7.4 million, or 48%, in the second quarter of 2010. The sequential improvement in gross margin was primarily due to the decrease in our fixed manufacturing costs in both absolute dollar terms and as percentage of net revenues. Our fixed manufacturing costs decreased from $1.8 million in the first quarter to $1.5 million in the second quarter. This decrease was driven by two factors: a reduction in run expense due to the relocation of our mechanical and thermal operations during the first quarter of 2011, and a reduction in the unapplied labor in our thermal segment due to the strong increase in production in the second quarter. This resulted in our fixed manufacturing cost as a percentage of our net revenues declining from 15% in the first quarter to 11% in the second quarter. To a lesser extent, there was a sequential reduction in our material costs which was 36.6% in the second quarter compared to 37.0% in the first quarter. The reduction in our material costs was due to a more favorable product mix in the second quarter compared to the first quarter.
The material costs in our mechanical products segment was 45.2% for the second quarter compared to 45.3% in the first, essentially unchanged. Material costs in our thermal products segment was 30.3% for the second quarter compared to 29.2% in the first quarter. Finally, the material costs for our electrical products segment was 35.7% for the second quarter compared to 36.1% in the first quarter.
I will now discuss the breakdown of operating expenses for the quarter. Selling expense for the second quarter was $1.6 million, or 12% of net revenues, compared with $1.4 million, or 12% of net revenues, for the 2011 first quarter, an increase of $202,000 or 15%. The increase was primarily the result of higher commission expense from the increased sales and, to a lesser extent, increased salary and benefit costs. These increases were partially offset by a reduction in our accruals for product warranty claims.
Second quarter engineering and product development expense was $822,000, or 6% of net revenues, compared with $813,000, or 7% of net revenues, for the first quarter, an increase of $9,000 or 1%. The increase was the result of higher levels of spending on R&D materials and patent legal costs, partially offset by reductions in salary and benefit costs.
General and administrative expense for the second quarter was $1.7 million, or 12% of net revenues, compared with $1.6 million, or 14% of net revenues in the first quarter, an increase of $32,000, or 2%. The increase in G&A expense was the result of accruals for profit-related bonuses and the costs associated with the filing of our registration statement on Form S-3 on May 3rd, partially offset by reductions in salary and benefit costs.
Other income for the second quarter was $10,000, compared with $56,000 for the first quarter. Other income for the first quarter included a $40,000 gain on the sale of fixed assets related to the move of our mechanical products segment.
For the second quarter, we recorded net income tax expense of $78,000, compared with an effective tax rate of 2.9%-excuse me, with an effective tax rate of 2.9%, compared with income tax expense of $60,000 for the first quarter which had an effective tax rate of 4.6%. The income tax expense recorded during the second quarter represented domestic state tax expense on our earnings. The reduction in our effective tax rate was caused by a higher proportion of foreign-based earnings in the second quarter which has a net operating loss carry forward to offset any foreign income tax expense. We currently expect to have an effective tax rate of approximately 3.1% for the balance of 2011. At the end of the second quarter, our federal net operating loss carry forward was approximately $1.9 million and our state NOLs range from approximately $150,000 to $3 million, depending on the state in question. We have fully utilized our NOLs in the states of Massachusetts and New Jersey.
Second quarter net earnings were $2.7 million or $0.26 per diluted share, as compared with first quarter net earnings of $1.3 million or $0.12 per diluted share. First quarter 2011 net earnings reflect the effect of approximately $128,000 in non-recurring costs related to the first quarter relocation of both the company's corporate headquarters and the operations of Temptronic Corporation. Second quarter 2011 net earnings reflect the effect of approximately $64,000 of non-recurring costs associated with the preparation and filing of the company's registration statement on Form S-3.
Consolidated headcount at the end of the second quarter which includes temporary staff was 141, compared with 130 at the end of the first quarter. Of the 11 staff added during the second quarter, nine were temporary production staff added in our thermal products segment in response to the significant increase in business the segment experienced. As we have noted before, we closely monitor our resource levels and will adjust as needed when we see any prolonged softness in demand levels and with the operational economies we have developed, we continue to see no necessity of significant step increases in personnel as business ramps.
I will now turn to our balance sheet. With demand fluctuations being the norm in our business, it is critical that we always strive to strengthen our balance sheet and that in down markets we can continue to strategically invest in key R&D and growth initiatives. Cash and cash equivalents at the end of the second quarter were $8.9 million. This compares with $5.2 million reported at March 31, 2011. The increase in cash during the second quarter was caused by our increased profitability coupled with strong cash collections during the second quarter, with DSOs reducing from 63 days at March 31st to 53 days at June 30th. As noted last quarter, we continue to expect cash to grow sequentially throughout 2011.
Accounts receivable was $8.3 million at June 30, 2011, a decrease of $555,000 from March 31, 2011. This decrease was driven by the improvement in cash collections driven by the aforementioned decrease in our days sales outstanding.
Inventory at the end of the second quarter of 2011 was $4.3 million compared with $4.0 million reported at the end of the first quarter. The increase in inventory was due to the purchase of material [unintelligible] scheduled in the third quarter of 2011.
Capital expenditures during the second quarter were $66,000 compared with first quarter capital expenditures of $574,000. First quarter capital expenditures were significantly higher than normal due to the relocation of the mechanical and thermal products segments operations.
As Bob noted earlier, bookings for the second quarter were $13.5 million and bookings for markets outside of semiconductor test were $3.8 million, or 28% of second quarter bookings. This compares with 2011 first quarter bookings of $13.1 million with bookings for markets outside of semiconductor test of $2.3 million, or 18% of first quarter bookings.
The backlog at the end of the second quarter was $7.2 million compared with $7.5 million at the end of the first quarter of 2011.
In terms of our financial outlook, as noted in our earnings release, we expect that net revenue for the third quarter ended September 30, 2011, will be in the range of $12 million to $13 million and that the net earnings will be in the range of $0.13 to $0.18 per diluted share. We currently expect that our Q3 2011 material costs as a percentage of revenue will increase approximately 100 basis points due to a change in the anticipated product mix in our thermal products segment.
The third quarter net earnings guidance provided is before giving effect to a possible reversal of our deferred tax asset valuation allowances. Please note that our outlook is based on the Company's current views with respect to operating in market conditions and customer forecasts which are subject to change.
Operator, that concludes our formal remarks. We can now take questions.