STOCK-BASED COMPENSATION (Details - RSA & RSU Rollforwards)	3 Months Ended
	Mar. 31, 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	45,626
Vested (in shares) | shares	(54,792)
Forfeited (in shares) | shares	(5,647)
Nonvested at the end of the period (in shares) | shares	137,561
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	112.20
Vested (in dollars per share) | $ / shares	49.71
Forfeited (in dollars per share) | $ / shares	76.27
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 87.17
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	0
Nonvested at the end of the period (in shares) | shares	14,464
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	0.00
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 25.14