STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) - USD ($)	6 Months Ended
	Jun. 30, 2020	May 24, 2017
Stock options, Grant Date Fair Value Valuation
Share price	$ 289.53	$ 156.70
Grant date fair value	$ 138.75
Aggregate stock options
Stock options, Shares
Outstanding at the beginning of the period (in shares)	777,871
Granted (in shares)	73,737
Exercised (in shares)	(20,141)
Forfeited (in shares)	(503)
Expired (in shares)	(1,974)
Outstanding at the end of the period (in shares)	828,990
Options exercisable at the end of the period (in shares)	670,266
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 69.87
Granted (in dollars per share)	276.38
Exercised (in dollars per share)	73.09
Forfeited (in dollars per share)	297.63
Expired (in dollars per share)	352.10
Outstanding at the end of the period (in dollars per share)	87.36
Options exercisable at the end of the period (in dollars per share)	$ 45.85
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	4 years 2 months 23 days
Options exercisable at the end of the period	3 years 1 month 28 days
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 169,184,000
Options exercisable at the end of the period	$ 164,215,000
Stock options, Grant Date Fair Value Valuation
Expected dividend rate	0.00%
Expected volatility, minimum	52.00%
Expected volatility, maximum	60.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	0.33%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	0.96%
Expected dividends	$ 0
Market options
Stock options, Shares
Outstanding at the beginning of the period (in shares)	463,440
Granted (in shares)	19,126
Exercised (in shares)	0
Forfeited (in shares)	0
Expired (in shares)	0
Outstanding at the end of the period (in shares)	482,566
Options exercisable at the end of the period (in shares)	0
Stock options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 204.31
Granted (in dollars per share)	275.82
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	0
Expired (in dollars per share)	0
Outstanding at the end of the period (in dollars per share)	207.14
Options exercisable at the end of the period (in dollars per share)	$ 0
Stock options, Weighted Average Remaining Contractual Term
Outstanding at the end of the period	7 years 3 months 7 days
Options exercisable at the end of the period	0 years
Stock options, Aggregate Intrinsic Value
Outstanding at the end of the period	$ 42,839,000
Options exercisable at the end of the period	$ 0
Stock options, Grant Date Fair Value Valuation
Grant date fair value	$ 196.07
Expected term	P7Y
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	51.00%
Expected dividend rate	0.00%
Risk-free interest rate	1.03%
Expected dividends	$ 0
Maximum number of shared to be earned	805,885
Percentage of target number of shares	167.00%
Performance Awards Earned	481,669
Minimum | Aggregate stock options
Stock options, Grant Date Fair Value Valuation
Expected term	P5Y
Maximum | Aggregate stock options
Stock options, Grant Date Fair Value Valuation
Expected term	P6Y3M
33% over a period of three years from the grant date | Option
Stock options, Grant Date Fair Value Valuation
Vesting period	3 years
25% over a period of four years from the grant date | Option
Stock options, Grant Date Fair Value Valuation
Vesting period	4 years