| Diluted average shares outstanding were 10,351,009 at September 30th. During the third quarter, we issued 9,000 shares of restricted stock and did not repurchase any shares. As of September 30, 2017, we had repurchased a cumulative total of 297,020 shares or approximately 2.8% of our outstanding common stock at a net cost of $1.2 million or $4 per share. Amortization and depreciation expense was $794,000 for the third quarter compared to $373,000 in the second quarter. Acquired intangible amortization was $613,000 in the third quarter, an increase of $364,000 from the second quarter.
And the increase in inquired intangible amortization is related to the acquisition of Ambrell, and Ambrell had depreciation and amortization expense of $637,000 for the third quarter compared to $227,000 in the second quarter.
EBITDA was $3.1 million for the third quarter, up $376,000 or 14% from the $2.7 million in EBITDA reported for the second quarter.
Consolidated headcount at the end of September, which includes temporary staff, was 216, a decrease of one person from the level we had at June 30th. Included in the September total were 89 Ambrell staff, down from 93 at the end of June. Our iTS operation added five staff while our EMS segment reduced headcount by two staff.
I’ll now turn to our balance sheet. Cash and cash equivalents at the end of the third quarter were $11.5 million, up $3.9 million from June 30th. We currently expect cash and cash equivalents to increase during the fourth quarter of 2017.
Accounts receivable decreased to $10.3 million at September 30th, a decrease of $1.7 million sequentially. Included in this amount was $2.5 million for Ambrell. Adjusted to exclude this amount, accounts receivable would have been $7.7 million, a decrease of $900,000 or 10% sequentially.
Inventory decreased $179,000 sequentially to $6 million at the quarter end. Included in this amount was $1.9 million for Ambrell. Adjusted to exclude this amount, inventories would have been $4.2 million, a decrease of $100,000 or 2% sequentially.
Capital expenditures during the third quarter were $232,000 up from $89,000 in the second quarter. Included in the third quarter capital expenditures was $32,000 for Ambrell. The additions during the third quarter primarily represented leased systems in our Thermal segment.
Bob provided consolidated and segment revenue and booking data earlier. The backlog at the end of September was $11.3 million, up slightly from the $11.1 million at the end of June. Included in the September 30th backlog was $5.9 million for Ambrell. Excluding this amount, backlog would have been $5.4 million down $1.2 million from the end of June.
In terms of our financial outlook, as noted in our earnings release, we expect that net revenue for the quarter ended December 31st, 2017 will be in the range of 17.5 million to 18.5 million and that GAAP net earnings will range from $0.11 to $0.15 per diluted share and that non-GAAP adjusted net earnings will range from $0.13 to $0.17 per diluted share.
We currently expect that our Q4 2017 product mix will be less favorable as compared with the second quarter, and that fourth quarter gross margin will range from 47% to 49%.
Finally I want to let investors know that we plan to file a shelf registration statement shortly after we file our Q3 Form 10-Q later this month.
The new $50 million shelf replaces the $30 million shelf that expired in May, 2017. The increase in the amount of shelf reflects the growth in our market cap from when the shelf was originally filed a number of years ago. Operator that concludes our formal remarks. We can now take questions.
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