STOCK-BASED COMPENSATION (Details - RSA & RSU Rollforwards)	6 Months Ended
	Jun. 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	76,344
Vested (in shares) | shares	65,562
Forfeited (in shares) | shares	(10,383)
Nonvested at the end of the period (in shares) | shares	152,773
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	132.43
Vested (in dollars per share) | $ / shares	51.15
Forfeited (in dollars per share) | $ / shares	81.03
Nonvested at the end of the period (in dollars per share) | $ / shares	$ 104.20
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