| Revenue Recognition (Tables) | 3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Jun. 30, 2019 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue from Contract with Customer [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Disaggregation of Revenue [Table Text Block] | The following table disaggregated our revenue by major source: 
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | 
The following is the expected future revenue recognition timing of deferred revenue as of June 30, 2019: 
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- References No definition available. 
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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