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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net income $ 2,154 $ 15,720 $ 12,278
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 14,189 14,148 14,203
Amortization of financing costs 519 650 641
Deferred rent (642) (243) 848
Deferred income taxes 1,030 (1,951) (1,440)
Net loss on disposal of fixed assets   84  
Stock compensation expense 3,390 2,942 5,286
Undistributed equity earnings (379) (544) (348)
Loss on early retirement of debt (Note F) 110 272  
Contingent consideration fair value adjustment     650
Changes in operating assets and liabilities (excluding the effects of business acquisitions)      
Accounts receivable 1,481 (17,977) 15,527
Inventory 10,818 4,491 (308)
Prepaid expenses, other current assets and other assets (951) (1,199) 1,087
Accounts payable, accrued expenses and other liabilities (9,778) 12,255 (397)
Income taxes receivable   132  
Income taxes payable (4,935) 969 (1,517)
NET CASH PROVIDED BY OPERATING ACTIVITIES 17,006 29,749 46,510
INVESTING ACTIVITIES      
Purchases of property and equipment (6,311) (3,380) (5,166)
Equity investments   567 112
Acquisitions, net of cash acquired (9,072) (21,699)  
Net proceeds from sale of property 15 64 26
NET CASH USED IN INVESTING ACTIVITIES (15,368) (24,448) (5,028)
FINANCING ACTIVITIES      
Proceeds from Revolving Credit Facility (Note F) 237,658 268,242 263,632
Repayments of Revolving Credit Facility (Note F) (229,696) (246,756) (290,346)
Repayments of Credit Agreement Term Loan (Note F) (9,500) (25,500) (10,000)
Proceeds from Short Term Loan (Note F) 187 118 289
Payments from Short Term Loan (Note F) (239) (248) (802)
Payments of tax withholding for stock based compensation (644) (86)  
Payment of financing costs (31) (30) (212)
Cash dividends paid (Note H) (2,475) (2,413) (2,150)
Payment of capital lease obligations (94) (68) (50)
Payment of contingent consideration     (391)
Proceeds from the exercise of stock options 2,537 2,353 843
Excess tax benefit from stock options   223 43
NET CASH USED IN FINANCING ACTIVITIES (2,297) (4,165) (39,144)
Effect of foreign exchange on cash 376 (384) (275)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (283) 752 2,063
Cash and cash equivalents at beginning of year 7,883 7,131 5,068
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 7,600 $ 7,883 $ 7,131