CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)	9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Cash flows from operating activities
Net income	$ 5,669,432	$ 4,984,627
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,498,255	1,433,018
Stock-based compensation	747,347	539,478
Deferred income taxes	(191,247)	(4,646)
Loss/(gain) on sale of property and equipment, net	1,080	(26,003)
Allowance for doubtful accounts	(258,714)	53,654
Changes in operating assets and liabilities:
Accounts receivable	(3,272,233)	(839,188)
Inventories	(1,063,228)	(2,138,267)
Prepaid expenses, deposits and other assets	(459,659)	(246,406)
Accounts payable and accrued expenses	2,395,460	2,028,062
Customers' advances	(2,045,097)	2,451,901
Accrued pension retirement benefits	(1,310,290)	(2,747,053)
Other non-current liabilities	1,647	1,647
Net cash provided by operating activities	1,712,753	5,490,824
Cash flows from investing activities
Proceeds from sale of property and equipment	0	33,848
Acquisitions of property and equipment	(1,016,028)	(1,636,866)
Purchases of investments	(1,022,266)	(1,010,534)
Proceeds from maturities of investments	1,258,598	497,155
Net cash used in investing activities	(779,696)	(2,116,397)
Cash flows from financing activities
Proceeds from new borrowings	222,778	426,802
Reduction of debt	(766,686)	(625,413)
Exercise of stock options	0	42,800
Payment of dividends	(3,128,334)	(2,902,505)
Purchase of treasury shares	0	(42,800)
Net cash used in financing activities	(3,672,242)	(3,101,116)
Effect of exchange rate changes on cash	35	34
Net (decrease) increase in cash and cash equivalents	(2,739,150)	273,345
Cash and cash equivalents at February 1	34,581,394	32,400,814
Cash and cash equivalents at October 31	31,842,244	32,674,159
Supplemental disclosure of cash flow information:
Cash paid for interest	127,046	146,586
Cash paid for income taxes	$ 1,831,206	$ 1,822,681