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Consolidated Statements of Shareholders' Equity (Parentheticals) (USD $) | 12 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Statement Of Stockholders Equity [Abstract] |  |  |
Exercise of warrants issuance of common stock | 2,090,226 | 382,503 | 4,550
Exercise price of warrants (in dollars per share) | $ 1.13 | $ 1.13 | $ 2.20
Cashless Exercise Of Warrants In Issuance Of Common Stock |  | 36,186 | 2,767

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- Definition This element represents cash less exercise of warrants in issuance of common stock. + References No definition available. + Details
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Namespace Prefix: | usat_
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- Definition This element represents exercise price per warrants. + References No definition available. + Details
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Namespace Prefix: | usat_
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Balance Type: | na
Period Type: | duration

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- Definition This element represents number of warrants exercised. + References No definition available. + Details
Name: | usat_NumberOfWarrantsExercised
Namespace Prefix: | usat_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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