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Significant Customers and Foreign Sales - Export sales to customers located outside the United States (Details) (USD $) | 12 Months Ended
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Feb. 28, 2014 | Feb. 28, 2013 | Feb. 28, 2015
Export sales to customers located outside the United States |  |  |
Foreign sales revenue | $ 6,447,000 us-gaap_SalesRevenueNet | $ 5,018,000 us-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 | 1,817,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskOneMember |  | 2,069,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskOneMember
Far East |  |  |
Export sales to customers located outside the United States |  |  |
Foreign sales revenue | 3,328,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskTwoMember |  | 2,147,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskTwoMember
Other |  |  |
Export sales to customers located outside the United States |  |  |
Foreign sales revenue | $ 1,302,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskThreeMember |  | 802,000 us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = SOTK_GeographicConcentrationRiskThreeMember

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- Definition 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 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 + Details
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- Definition 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 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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