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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 5) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Incentive Trip Accrual |  |  |  |  |  |  |  |  |  |  |
Convention and meeting costs | $ 4,798 |  |  |  | $ 4,243 |  |  |  | $ 4,798 | $ 4,243 |
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |
Minimum cumulative inflation rate for considering a country to have a highly inflationary economy (as a percent) |  |  |  |  |  |  |  |  | 100.00% |  |
Period of cumulative inflation rate for considering a country to have a highly inflationary economy |  |  |  |  |  |  |  |  | 3 years |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Period for amortization membership fees |  |  |  |  |  |  |  |  | 1 year |  |
Period for sales return from date of purchase |  |  |  |  |  |  |  |  | 90 days |  |
Sales return |  |  |  |  |  |  |  |  | $ 1,200 | 1,500 | $ 1,500
Shipping and handling revenues |  |  |  |  |  |  |  |  | 9,200 | 9,800 | 10,900
Advertising Costs |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | 2,200 | 2,300 | 2,200
Research and Development |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  | 2,800 | 2,500 | 2,000
Net income attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  |  |  |  |  |  |  | 12,571 | 19,976 | 17,653
Income (loss) from discontinued operations | 0 | $ 804 | $ 0 | $ 1,312 | (4,964) | $ (4,106) | $ (316) | $ (571) | 2,116 | (9,957) | (44)
Net income | $ 3,693 | $ 2,766 | $ 2,561 | $ 5,667 | $ (3,897) | $ 1,017 | $ 3,234 | $ 9,665 | $ 14,687 | $ 10,019 | $ 17,609
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 18,656 | 17,108 | 15,997
Basic earnings per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) | $ 0.20 | $ 0.10 | $ 0.14 | $ 0.23 | $ 0.05 | $ 0.30 | $ 0.22 | $ 0.63 | $ 0.67 | $ 1.15 | $ 1.10
Income (loss) from discontinued operations (in dollars per share) | 0.00 | 0.04 | 0.00 | 0.07 | (0.26) | (0.24) | (0.02) | (0.03) | 0.11 | (0.57) | 0.00
Net Income (loss) per common share attributable to shareholders (in dollars per share) | 0.20 | 0.15 | 0.14 | 0.30 | (0.21) | 0.06 | 0.20 | 0.60 | $ 0.79 | $ 0.58 | $ 1.10
Diluted Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 18,656 | 17,108 | 15,997
Stock-based awards (in shares) |  |  |  |  |  |  |  |  | 521 | 533 | 393
Diluted weighted-average shares outstanding |  |  |  |  |  |  |  |  | 19,177 | 17,641 | 16,390
Diluted earnings per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) | 0.19 | 0.10 | 0.13 | 0.23 | 0.05 | 0.29 | 0.22 | 0.61 | $ 0.66 | $ 1.12 | $ 1.08
Income (loss) from discontinued operations (in dollars per share) | 0.00 | 0.04 | 0.00 | 0.07 | (0.25) | (0.23) | (0.02) | (0.03) | 0.11 | (0.56) | (0.01)
Net Income (loss) per common share attributable to shareholders (in dollars per share) | $ 0.19 | $ 0.14 | $ 0.13 | $ 0.30 | $ (0.20) | $ 0.06 | $ 0.20 | $ 0.58 | $ 0.77 | $ 0.56 | $ 1.07
Potentially dilutive shares excluded from diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 345 | 133 | 135
Potentially anti-dilutive shares excluded from diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 688 | 210 | 210

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