Consolidated Statement of Cash Flows (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Cash flows from operating activities:
Net income	$ 3,039,750	$ 8,123,936	$ 6,556,667
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,160,062	1,760,763	1,684,406
Provision for deferred income taxes	113,717	(910,413)	472,455
Share-based compensation expense	731,583	541,175	485,945
Tax impact of share-based compensation	105,988	0	102,737
Gain on sale of assets	0	(290,526)	(809,200)
Provision for contract adjustments	1,810,557	2,943,470	637,846
Bad debt expense	514,411	450,000	0
(Increase) decrease in:
- contract receivables	(2,287,607)	(18,286,613)	(5,661,388)
- other current assets	314,587	(114,402)	233,414
- income tax receivable	(2,502,431)	0	802,926
- other non-current assets	31,973	42,082	(64,430)
Increase (decrease) in:
- accounts payable	(1,859,530)	822,701	(3,120,409)
- accrued payroll costs	(1,458,928)	1,545,961	149,316
- income taxes payable	(1,375,614)	(98,721)	1,066,930
- billings in excess of revenue	1,237,329	3,396,873	(121,749)
- other accrued liabilities	(936,135)	1,084,505	18,273
Net cash provided by (used in) operating activities	(360,288)	1,010,791	2,433,739
Cash flows provided by (used in) investing activities:
Acquistion of noncontrolling interest of subsidiaries	(908,892)	(637,745)	(1,000,000)
Purchase of Lowham Engineering LLC	0	0	(200,000)
Purchase of Engineering Consulting Services, Inc., net of cash equivalents of $309,487	0	(790,513)	0
Purchase of property, building and equipment	(4,443,962)	(2,476,059)	(1,992,724)
Change in accounts payable due to purchase of equipment	(283,071)	953,749	0
Proceeds from sale of property and equipment	0	322,807	959,200
Sale (purchase) of investment securities, net	102,527	(195,163)	(55,791)
Cash used in investing activities	(5,533,398)	(2,822,924)	(2,289,315)
Cash flows provided by (used in) financing activities:
Dividends paid	(2,046,657)	(1,814,839)	(1,684,482)
Proceeds from debt	145,401	795,795	468,038
Repayment of debt and capital lease obligations	(974,644)	(945,320)	(778,035)
Net proceeds from line of credit	12,309,335	0	0
Distributions to noncontrolling interests	(1,123,896)	(847,749)	(845,106)
Proceeds from sale of subsidiary shares to noncontrolling interests	41,634	90,368	227,562
Purchase of treasury stock	(363,050)	(1,335,960)	0
Net cash provided by (used in) financing activities	7,988,123	(4,057,705)	(2,612,023)
Effect of exchange rate changes on cash and cash equivalents	(156,509)	52,486	49,908
Net increase (decrease) in cash and cash equivalents	1,937,928	(5,817,352)	(2,417,691)
Cash and cash equivalents at beginning of period	8,529,842	14,347,194	16,764,885
Cash and cash equivalents at end of period	$ 10,467,770	$ 8,529,842	$ 14,347,194