Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 33,580,000	$ 33,312,000
Adjustments to reconcile net income to net cash provided by operating activities:
Stock option compensation expense	1,489,000	1,152,000
Depreciation	423,000	407,000
Amortization of purchased intangibles	182,000	182,000
Deferred income tax (benefit) expense	(336,000)	1,482,000
Gains on the deconsolidation of variable interest entities		(2,444,000)
Changes in operating assets and liabilities
Accounts receivable, net	546,000	4,372,000
Costs and estimated earnings in excess of billings	213,000	973,000
Prepaid expenses and other assets	(308,000)	(1,110,000)
Accounts payable and accrued expenses	30,172,000	(12,124,000)
Billings in excess of costs and estimated earnings	21,423,000	1,856,000
Net cash provided by operating activities	87,384,000	28,058,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(1,842,000)	(925,000)
Net cash used in investing activities	(1,842,000)	(925,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from the exercise of stock options	3,884,000	2,506,000
Increase in notes receivable from project development entities	(614,000)	(2,326,000)
Payments received on loans made to Moxie Liberty		4,294,000
Deconsolidation of the cash of variable interest entities		(399,000)
Net cash provided by financing activities	3,270,000	4,075,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	88,812,000	31,208,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	272,209,000	175,142,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	361,021,000	206,350,000
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	$ 11,022,000	$ 18,294,000