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Detail Of Certain Balance Sheet Accounts | 12 Months Ended
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Sep. 30, 2016
Detail Of Certain Balance Sheet Accounts [Abstract] |
Detail Of Certain Balance Sheet Accounts | 6. DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS Activity in our allowance for doubtful accounts on accounts and long-term receivables consists of the following:
|  |  | Years Ended September 30,
|  |  | 2016 |  | 2015
Balance at beginning of period |  | $ | 842 |  | $ | 780
Additions to costs and expenses |  |  | 360 |  |  | 416
Deductions for uncollectible receivables written off, net of recoveries |  |  | (466) |  |  | (354)
Balance at end of period |  | $ | 736 |  | $ | 842
Accounts payable and accrued expenses consist of the following:
|  | Years Ended September 30,
|  | 2016 |  | 2015
Accounts payable, trade |  | $ | 64,963 |  | $ | 47,033
Accrued compensation and benefits |  |  | 26,827 |  |  | 22,527
Accrued insurance liabilities |  |  | 5,464 |  |  | 4,518
Other accrued expenses |  |  | 11,568 |  |  | 8,832
|  | $ | 108,822 |  | $ | 82,910
Contracts in progress are as follows:
|  | Years Ended September 30,
|  | 2016 |  | 2015
Costs incurred on contracts in progress |  | $ | 409,075 |  | $ | 329,942
Estimated earnings |  |  | 48,618 |  |  | 37,576
|  |  | 457,693 |  |  | 367,518
Less--Billings to date |  |  | (466,368) |  |  | (380,365)
Net contracts in progress |  | $ | (8,675) |  | $ | (12,847)
Costs and estimated earnings in excess of billings |  |  | 15,554 |  |  | 12,318
Less--Billings in excess of costs and estimated earnings |  |  | (24,229) |  |  | (25,165)
Net contracts in progress |  | $ | (8,675) |  | $ | (12,847)
Other non-current assets are comprised of the following:
|  | Years Ended September 30,
|  | 2016 |  | 2015
Deferred tax assets |  | $ | - |  | $ | 147
Executive Savings Plan assets |  |  | 599 |  |  | 617
Securities and equity investments |  |  | 919 |  |  | 919
Other |  |  | 2,192 |  |  | 1,301
Total |  | $ | 3,710 |  | $ | 2,984
Securities and Equity Investments Investment in EnerTech At September 30, 2016 and 2015, we held an investment in EnerTech Capital Partners II L.P. (“EnerTech), a private investment fund. As our investment was 2.21 % of the overall ownership in EnerT ech at September 30, 2016 and 2015, we account for this investment using the cost method of accounting. EnerTech’s investment portfolio from time to time results in unrealized losses ref lecting a possible, other-than-temporary, i mpairment of our inve stment. The carrying value of our investment in EnerTech at both September 30, 2016 and 2015 was $919. The following table presents the reconciliation of the carrying value and unrealized gains (losses) to the fair v alue of the investment in EnerTech as of September 30, 2016 and 2015:
|  | Years Ended September 30,
|  | 2016 |  | 2015
Carrying value |  | $ | 919 |  | $ | 919
Unrealized gains |  |  | 159 |  |  | 66
Fair value |  | $ | 1,078 |  | $ | 985
At each reporting date, the Company performs an evaluation of impairment for securities to determine if any unrealized losses are other-than-temporary. For equity securities, this evaluation considers a number of factors including, but not limited to, the length of time and extent to which the fair value has been less than cost, the financial condition and near term prospects of the issuer and management’s ability and intent to hold the securities until fair value recovers. The assessment of the ability and intent to hold these securities to recovery focuses on liquidity needs, asset and liability management obj ectives and securities portfolio objectives. Based on the results of this evaluation, we believe the unrealized gain at September 30, 2016 indicated our investment was not impaired. In December 2015, EnerTech’s general partner, with the consent of the fund’s investors, extended th e fund through December 31, 2016. The fund is expected to terminate on this date unless extended by the fund’s valuation committee. The fund may be extended for another one-year period through December 31, 2017 with the consent of the fund’s valuation committee.

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