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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
OPERATING ACTIVITIES    
Net income $ 5,915 $ 16,842
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,073 1,027
Accretion of discount related to marketable securities, net   (5)
Stock-based compensation expense 1,157 1,082
Deferred income tax provision/ (benefit) 142 (375)
(Increase) decrease in assets:    
Accounts receivable (2,961) (10,880)
Inventories (1,637) (4,134)
Prepaid expenses and other current assets 414 406
Income taxes receivable 753 330
Other non-current assets 79 (860)
Increase (decrease) in liabilities:    
Accounts payable 4,824 4,592
Accrued expenses and other liabilities 1,355 2,659
Other long-term liabilities 581 1,679
Net cash provided by operating activities 11,695 12,363
INVESTING ACTIVITIES    
Capital expenditures (1,031) (1,719)
Purchases of marketable securities   (299)
Sales of marketable securities   7,530
Maturities of marketable securities   448
Net cash (used for) provided by investing activities (1,031) 5,960
FINANCING ACTIVITIES    
Payment of dividends (6,770) (8,209)
Cash paid for common stock purchased and retired (1,084) (5,892)
Net cash used for financing activities (7,854) (14,101)
Net increase in cash and cash equivalents 2,810 4,222
Cash and cash equivalents at beginning of period 19,804 8,745
Cash and cash equivalents at end of period 22,614 12,967
Supplemental information:    
Income tax payments, net $ 228 $ 3,526