Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 4)

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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Incentive Trip Accrual                      
Convention and meeting costs $ 5,784       $ 4,624       $ 5,784 $ 4,624  
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                 1,454 2,249 606
Shipping and handling revenues                 10,868 11,264 11,615
Advertising Costs                      
Advertising costs                 2,194 1,418 1,191
Research and Development                      
Research and development expenses                 2,039 1,464 1,552
Net income available to common stockholders                      
Net income $ 1,843 $ 4,850 $ 6,052 $ 4,864 $ 4,496 $ 6,370 $ 7,286 $ 7,228 $ 17,609 $ 25,380 $ 17,601
Basic weighted-average shares outstanding                 15,997 15,648 15,550
Basic net income per common share:                      
Net income (in dollars per share) $ 0.11 $ 0.30 $ 0.38 $ 0.31 $ 0.28 $ 0.41 $ 0.47 $ 0.46 $ 1.10 $ 1.62 $ 1.13
Diluted Shares Outstanding                      
Basic weighted-average shares outstanding                 15,997 15,648 15,550
Stock-based awards (in shares)                 393 339 145
Diluted weighted-average shares outstanding                 16,390 15,987 15,695
Diluted net income per common share:                      
Net income (in dollars per share) $ 0.11 $ 0.29 $ 0.38 $ 0.30 $ 0.28 $ 0.40 $ 0.46 $ 0.46 $ 1.07 $ 1.59 $ 1.12
Potentially dilutive shares excluded from diluted per share amounts:                      
Stock options (in shares)                 135 88 219
Potentially anti-dilutive shares excluded from diluted per share amounts:                      
Stock options (in shares)                 210 254 200