| 4. Condensed Consolidated Balance Sheets | 6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Disclosure Text Block Supplement [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||
| Condensed Consolidated Balance Sheets | 
 
 Inventories 
 Inventories 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://fasb.org/us-gaap/role/ref/legacyRef 
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