LONG TERM INVESTMENTS - Equity method investments (Details)	12 Months Ended
Dec. 31, 2020 USD ($)	May 31, 2020 USD ($)	May 31, 2020 HKD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investements	$ 424,333
Investment loss	40,625
Ocean Joy
Schedule of Equity Method Investments [Line Items]
Equity method investements	$ 424,333
Investment amount		$ 462,276	$ 3,600,000
Percentage of ownership investment		30.00%	30.00%

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of realized and unrealized gain (loss) on investment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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