Note 2 - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)	9 Months Ended	12 Months Ended
	Oct. 31, 2015	Jan. 31, 2015
Certificates of Deposit [Member]
Book Value	$ 15,509,000
Net Unrealized Gains
Fair Value	$ 15,509,000
Corporate Bond Securities [Member]
Book Value	11,205,000	$ 9,130,000
Net Unrealized Gains	66,000	153,000
Fair Value	11,271,000	9,283,000
Money Market Funds [Member]
Book Value	$ 5,235,000	$ 7,650,000
Net Unrealized Gains
Fair Value	$ 5,235,000	$ 7,650,000
Fixed Income Funds [Member]
Book Value	1,259,000	1,324,000
Net Unrealized Gains	26,000	(11,000)
Fair Value	1,285,000	1,313,000
UNITED STATES
Fair value - cash on hand	9,455,000	12,042,000
Overseas [Member]
Fair value - cash on hand	52,474,000	63,810,000
Book Value	33,208,000	18,104,000
Net Unrealized Gains	92,000	142,000
Fair Value	33,300,000	18,246,000
Fair value - cash on hand	61,929,000	75,852,000
Total cash, cash equivalents and marketable securities	95,229,000	94,098,000
Cash and cash equivalents	67,164,000	83,502,000
Short-term marketable securities	24,528,000	6,347,000
Long-term marketable securities	$ 3,537,000	$ 4,249,000