Thanks Bob.
Net revenues for the quarter ended March 31, 2010, were $9.5 million compared to $8.4 million for the fourth quarter of 2009, an increase of $1.1 million or 13%. Net income for the first quarter of 2010 was $1.1 million or $0.11 per diluted share, compared to $142,000 or $0.01 per diluted share in the fourth quarter of 2009. For the first quarter end-user net revenues were $7.1 million or 75% of net revenues, compared with $6.6 million or 79% of net revenues in the fourth quarter of 2009. OEM net revenue was $2.4 million or 25% of net revenues in the first quarter compared with $1.8 million or 21% of net revenues in the fourth quarter. Net revenues for markets outside of semiconductor test were $1.3 million or 14% of net revenues for the first quarter of 2010 compared to $650,000 or 7% of net revenues in the fourth quarter of 2009. On a product-segment basis, net revenues for the Mechanical Products segment were $4.7 million, or 49% of net revenues in the first quarter, compared with $4.5 million or 54% of n et revenues in the fourth quarter.
Our Thermal Products segment had net revenues at $3.5 million or 37% of net revenues in the first quarter, compared with $3.1 million or 37% of net revenues in the fourth quarter. And finally, our Electrical Products segment reported net revenues of $1.3 million or 14% of net revenues in the first quarter compared with $835,000 or 9% of net revenues in the fourth quarter.
The Company's overall gross margin for the quarter ended March 31, 2010, was $4.5 million or 47.6% of net revenues compared to $3.2 million or 37.5% of net revenues for the fourth quarter of 2009. Material costs were 33.6% of net revenues in the first quarter compared to 39.2% in the fourth quarter. The improvement in gross margin as a percentage of net revenues in the first quarter was primarily the result of reductions in our material cost as a percentage of net revenue, which was due to changes in product mix with a lower level of manipulator products sold in the first quarter, compared to the fourth quarter. In addition, the absolute dollar amount of inventory obsolescence charges, direct labor costs and fixed manufacturing costs declined approximately $170,000 and with the higher revenue levels our fixed manufacturing costs as a percentage of net revenues declined from 17.6% to 14.8%.
I will now discuss a breakdown of operating expenses for the quarter. Selling expense was relatively flat quarter over quarter at $1.2 million or 13% of net revenues for the first quarter compared to $1.2 million or 14% of net revenues in the fourth quarter increasing $57,000 or 5%. The increase is primarily due to higher levels of sales, travel costs, as well as increased salary and benefit expense resulting from the restoration of employee salaries which have been reduced in our cost containment efforts last year. In addition, sales commission expense was up due to higher levels of sales. Engineering and product development expense was $701,000 or 7% of net revenues for the first quarter, compared to $570,000 or 7% of net revenues in the fourth quarter an increase of $131,000 or 23%. The increase was driven by increased salary and benefit expense, which resulted from the restoration of employee salaries as previously discussed as well as the addition of an engineer in our Mechanical Products segment.
General and administrative expense was $1.5 million or 16% of net revenues in the first quarter compared to $1.2 million or 15% of net revenues in the fourth quarter, an increase of $255,000 or 21%. The increase was driven by a number of factors including the accrual of profit related bonuses, increased salary and benefit expense resulting from the aforementioned salary restoration, higher levels of directors fees, which were also fully restored on January 1, 2010, and accruals related to compliance with Sarbanes Oxley section 404(b) auditor attestation which will apply to the Company for the first time at December 31, 2010. We do not have any restructuring charges during the first quarter of 2010, compared to $307,000 accrued in the fourth quarter related to the consolidation of Sigma's operations from California to Massachusetts.
Consolidated head count was 117 at March 31, 2010, up 10 individuals from December 31, 2009. All three product segments added staff in response to the significant increases in demand that we have experienced, with most additions in the direct labor and material handling areas which are a part of cost of revenues. Some of these staff were added late in the first quarter, so the full impact of the cost of these staff additions was not fully reflected in the first quarter results. We currently expect total consolidated compensation cost to increase by approximately $550,000 in the second quarter of 2010 compared to the first quarter.
This increase reflects staff currently hired as well as an additional staff person expected to be hired in the second quarter. Included in these increases, approximately $152,000 of projected 401(k) match expense and profit sharing expense during the second quarter. As we previously discussed, this benefit is the final employee benefit to be restored and was brought back on April 1, 2010. On top of increases in compensation, we will be accruing an additional $50,000 per quarter for the balance of this year for cost associated with compliance of Section 404(b) of Sarbanes Oxley. We accrued approximately $75,000 related to this issue during the first quarter. Our other expense was $4,000 for the first quarter, compared to other income of $209,000 for the fourth quarter, which included foreign exchange gains of approximately $185,000 related to the closure of our Japanese subsidiary during December.
Income tax expense was $3,000 for the first quarter compared to a $46,000 income tax benefit booked in the fourth quarter of 2009. At the end of the first quarter, our federal net operating loss carry forward was approximately $12.6 million and our state NOLs ranged from several hundred thousand to approximately $13.0 million depending on the state in question. Cash and cash equivalents at March 31, 2010 were $2.9 million up from $2.6 million at the end of 2009. We currently expect to build cash throughout 2010 given the significant rebound in our business. During the third quarter of 2010, we are required to make the first of four $381,000 annual principal installments under the notes payable to shareholders related to our acquisition of Sigma. Interest on this note currently accrues at prime plus 1.25%. Capital expenditures during the first quarter of 2010 were $54,000 compared to $25,000 during the fourth quarter of 2009. As Bob previously noted, bookings increased in the first quarter of 2010 to $14 mill ion from the $9.4 million in the fourth quarter an increase of $4.6 million or 49%. Our bookings included non-semiconductor related orders of $2.1 million or 15% of total orders in the first quarter of 2010 compared to $830,000 or 9% of total orders booked in the fourth quarter. Our backlog at the end of the first quarter was $9.1 million double the $4.5 million at the end of the fourth quarter.
In terms of our financial outlook as we noted in our earnings release, we expect continued improvements in net revenues and net income in the second quarter ending June 30, 2010, on both a sequential and year over year basis. This outlook is based on the Company's current views with respect to operating and market conditions and customer forecasts which are subject to change. Operator, that concludes our formal remarks. We will now take questions.