| 5. Condensed Consolidated Balance Sheets | 6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||
| Disclosure Text Block Supplement [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Condensed Consolidated Balance Sheets | Inventories, net 
 Inventories, net consist of the following: 
 
 
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| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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