XML 89 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Website
shares
Dec. 31, 2017
USD ($)
Website
shares
Dec. 31, 2016
USD ($)
shares
Condensed Balance Sheet Statements, Captions [Line Items]      
Number of E-Commerce Websites | Website 7 4  
Available-for-sale Securities, Gross Realized Gain (Loss) $ 189,000 $ (5,000) $ 661,000
Goodwill, Impairment Loss 0 1,000,000 $ 0
Accretion (Amortization) of Discounts and Premiums, Investments 728,000 983,000  
Cash Equivalents, at Carrying Value $ 77,050,000 $ 58,436,000  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 45,000 14,000 561,000
Advertising Expense $ 21,921,000 $ 19,629,000 $ 16,024,000
Shipping, Handling and Transportation Costs $ 43,340,000 32,395,000 27,079,000
Defined Benefit Plan Matching Contribution Percentage Of Employees Contributions 50.00%    
Defined Benefit Plan Maximum Percentage To Be Matched Of Employees Compensation 6.00%    
Pension Cost (Reversal of Cost) $ 1,893 1,819,000 $ 1,633,000
Available-for-sale Securities, Gross Unrealized Gain (Loss) $ 67,000    
Short-term Investments [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Available-for-sale Securities, Gross Unrealized Loss   106,000  
Available-for-sale Securities, Gross Unrealized Gain   1,000  
Other Long-term Investments [Member]      
Condensed Balance Sheet Statements, Captions [Line Items]      
Available-for-sale Securities, Gross Unrealized Loss   90,000  
Available-for-sale Securities, Gross Unrealized Gain   $ 3,000