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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
OPERATING ACTIVITIES    
Net income $ 4,208 $ 7,469
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 536 505
Accretion of discount related to marketable securities, net   (5)
Stock-based compensation expense 576 538
Deferred income tax provision/ (benefit) 528 (109)
(Increase) decrease in assets:    
Accounts receivable (2,563) (6,022)
Inventories (4,393) (1,054)
Prepaid expenses and other current assets 614 668
Income taxes receivable 174  
Other non-current assets 1,087 (651)
Increase (decrease) in liabilities:    
Accounts payable 5,917 7,744
Accrued expenses and other liabilities 553 1,956
Other long-term liabilities (1,183) 1,005
Net cash provided by operating activities 6,054 12,044
INVESTING ACTIVITIES    
Capital expenditures (665) (1,108)
Purchases of marketable securities   (299)
Sales of marketable securities   7,530
Maturities of marketable securities   448
Net cash provided by (used for) investing activities (665) 6,571
FINANCING ACTIVITIES    
Payment of dividends (4,074) (4,117)
Cash paid for common stock purchased and retired (1,055) (4,896)
Net cash used for financing activities (5,129) (9,013)
Net increase in cash and cash equivalents 260 9,602
Cash and cash equivalents at beginning of year 19,804 8,745
Cash and cash equivalents at end of year $ 20,064 18,347
Supplemental information:    
Income tax payments, net   $ 1,446