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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
OPERATING ACTIVITIES    
Net income $ 12,450 $ 24,697
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,509 1,556
Accretion of discount related to marketable securities, net   (5)
Stock-based compensation expense 2,657 1,626
Gain on sale of assets (30)  
Deferred income tax benefit (234) (1,074)
(Increase) decrease in assets:    
Accounts receivable (1,910) (11,292)
Inventories (1,337) 1,757
Prepaid expenses and other current assets 173 254
Income taxes receivable 701 452
Other non-current assets (788) (918)
Increase (decrease) in liabilities:    
Accounts payable 5,706 4,951
Income taxes payable 737 446
Accrued expenses and other liabilities 1,715 3,502
Other long-term liabilities 1,286 2,122
Net cash provided by operating activities 22,635 28,074
INVESTING ACTIVITIES    
Capital expenditures (1,458) (2,013)
Proceeds from sale of assets 34  
Purchases of marketable securities   (299)
Sales of marketable securities   7,530
Maturities of marketable securities   448
Net cash (used for) provided by investing activities (1,424) 5,666
FINANCING ACTIVITIES    
Payment of dividends (9,486) (12,292)
Cash paid for common stock purchased and retired (2,515) (7,163)
Net cash used for financing activities (12,001) (19,455)
Net increase in cash and cash equivalents 9,210 14,285
Cash and cash equivalents at beginning of period 19,804 8,745
Cash and cash equivalents at end of period 29,014 23,030
Supplemental information:    
Income tax payments, net $ 1,738 $ 5,710