CONSOLIDATED STATEMENT OF CASH FLOWS (unaudited) (USD $)	3 Months Ended
Apr. 30, 2012	Apr. 30, 2011
Cash flows from operating activities
Net income	$ 1,258,698	$ 1,412,507
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	487,599	481,932
Stock-based compensation	441,401	179,826
Deferred income taxes	(209,278)	(606)
Loss on sales of property and equipment, net	1,080	0
Allowance for doubtful accounts	(38,862)	19,215
Change in operating assets and liabilities:
Accounts receivable	2,171,197	(1,636,920)
Inventories	(1,361,633)	(388,008)
Prepaid expenses, deposits and other assets	123,755	(38,705)
Accounts payable and accrued expenses	(862,836)	687,771
Customers' advances	(1,036,453)	(52,906)
Accrued pension retirement benefits	62,569	(2,776,476)
Other non-current liabilities	549	549
Net cash provided by operating activities	1,037,786	(2,111,821)
Cash flows from investing activities
Acquisitions of property and equipment	(474,884)	(235,679)
Purchase of investments	(763,264)	0
Proceeds from maturities of investments	756,073	0
Net cash used in investing activities	(482,075)	(235,679)
Cash flows from financing activities
Proceeds from new borrowings	0	407,731
Repayment of debt	(387,451)	(123,023)
Exercise of stock options	0	42,800
Payment of dividends	(1,042,183)	(967,445)
Purchase of treasury shares	0	(42,800)
Net cash used in financing activities	(1,429,634)	(682,737)
Effect of exchange rate changes on cash	11,495	(4,268)
Net decrease in cash and cash equivalents	(862,428)	(3,034,505)
Cash and cash equivalents at February 1	34,581,394	32,400,814
Cash and cash equivalents at April 30	33,718,966	29,366,309
Supplemental disclosure of cash flow information:
Cash paid for interest	43,436	49,030
Cash paid for income taxes	$ 370,703	$ 228,584

Name:	us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).