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Significant Customers and Foreign Sales - Export sales to customers located outside the United States (Details) (USD $)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2015
Export sales to customers located outside the United States
Foreign sales revenue	$ 6,447,000us-gaap_SalesRevenueNet	$ 5,018,000us-gaap_SalesRevenueNet
Significant customers and foreign sales
Percent of total sales	63.00%us-gaap_ConcentrationRiskPercentage1	47.00%us-gaap_ConcentrationRiskPercentage1
One Customer
Significant customers and foreign sales
Percent of total sales			7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = SOTK_MajorCustomerMember
Western Europe
Export sales to customers located outside the United States
Foreign sales revenue	1,817,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskOneMember		2,069,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskOneMember
Far East
Export sales to customers located outside the United States
Foreign sales revenue	3,328,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskTwoMember		2,147,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskTwoMember
Other
Export sales to customers located outside the United States
Foreign sales revenue	$ 1,302,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskThreeMember		802,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskThreeMember

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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