CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Cash flows from operating activities
Net income	$ 8,045,223	$ 7,133,701	$ 6,139,132
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,022,450	1,914,418	1,824,685
Deferred income taxes	855,679	1,197,654	439,069
Loss on sales of property and equipment, net	2,176	102,386	8,231
Stock-based compensation	903,933	744,306	645,891
Allowance for doubtful accounts	(203,036)	46,986	240,133
Change in operating assets and liabilities:
Accounts receivable	(1,424,056)	(2,173,195)	(1,464,863)
Inventories	62,511	(2,450,559)	676,071
Prepaid expenses, deposits and other assets	(476,387)	(350,416)	(243,598)
Accounts payable and accrued expenses	(1,423,633)	3,116,045	977,454
Customers' advances	(1,835,262)	2,323,603	22,004
Accrued pension retirement benefits	(1,247,317)	(2,647,339)	(668,901)
Other non-current liabilities	2,197	2,197	2,197
Net cash provided by operating activities	5,284,478	8,959,787	8,597,505
Cash flows from investing activities
Proceeds from sales of property and equipment	0	33,566	36,387
Acquisitions of property and equipment	(1,997,489)	(2,097,233)	(1,665,949)
Purchase of investments	(1,022,266)	(1,010,535)	(745,218)
Proceeds from maturities of investments	1,258,596	497,155	725,004
Payment for acquisition of business	0	0	(955,268)
Net cash used in investing activities	(1,761,159)	(2,577,047)	(2,605,044)
Cash flows from financing activities
Proceeds from new borrowings	224,336	477,692	189,074
Reduction of debt	(877,645)	(727,399)	(717,134)
Exercise of stock options	296,108	152,970	780,834
Payment of dividends	(4,193,142)	(3,943,332)	(3,597,539)
Purchase of treasury shares	(289,868)	(167,534)	(935,631)
Net cash used in financing activities	(4,840,211)	(4,207,603)	(4,280,396)
Effect of exchange rate changes on cash	41,406	5,443	26,645
Net (decrease) increase in cash and cash equivalents	(1,275,486)	2,180,580	1,738,710
Cash and cash equivalents at beginning of year	34,581,394	32,400,814	30,662,104
Cash and cash equivalents at end of year	$ 33,305,908	$ 34,581,394	$ 32,400,814