STOCK-BASED COMPENSATION (Details - RSA & RSU Rollforwards)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
RSUs
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, Number of Shares
Nonvested at the beginning of the period (in shares) | shares	152,374
Granted (in shares) | shares	83,113
Vested (in shares) | shares	72,112
Forfeited (in shares) | shares	(14,078)
Nonvested at the end of the period (in shares) | shares	149,297
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share) | $ / shares	$ 65.64
Granted (in dollars per share) | $ / shares	138.07
Vested (in dollars per share) | $ / shares	54.79
Forfeited (in dollars per share) | $ / shares	82.37
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 109.64
Restricted stock
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, Number of Shares
Nonvested at the beginning of the period (in shares) | shares	14,464
Granted (in shares) | shares	0
Vested (in shares) | shares	14,464
Nonvested at the end of the period (in shares) | shares	0
Nonvested RSUs, Restricted Stock and Restricted Stock Units with Performance Conditions, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share) | $ / shares	$ 25.14
Granted (in dollars per share) | $ / shares	0.00
Vested (in dollars per share) | $ / shares	25.14
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 0.00