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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING ACTIVITIES      
Net income $ 28,239 $ 28,488 $ 19,300
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation expense 2,090 1,820 1,526
Gain on sale of equipment and property     (8)
(Accretion) of discount/ amortization of premium related to marketable securities (5) 213 425
Stock-based compensation expense 2,123 2,089 2,682
Deferred income tax (benefit) provision (620) 378 1,519
(Increase) decrease in assets:      
Accounts receivable (2,735) (821) (1,964)
Inventories 5,217 (8,764) 4,482
Prepaid expenses and other current assets (261) 301 (273)
Income taxes receivable (455) 262 (685)
Other non-current assets (1,355) (563) (912)
Increase (decrease) in liabilities:      
Accounts payable (787) (689) 199
Other accrued expenses (386) (505) 1,760
Other long-term liabilities 2,852 566 1,588
Net cash provided by operating activities 33,917 22,775 29,639
INVESTING ACTIVITIES      
Capital expenditures (2,334) (2,154) (2,410)
Proceeds from sale of assets     8
Sales and maturities of marketable securities 7,978 21,423 18,067
Purchases of marketable securities (299) (16,209) (22,214)
Net cash provided by (used for) investing activities 5,345 3,060 (6,549)
FINANCING ACTIVITIES      
Payment of dividends (19,756) (17,252) (11,504)
Cash paid for common stock purchased and retired (8,447) (7,522) (6,521)
Net cash used for financing activities (28,203) (24,774) (18,025)
Net increase in cash and cash equivalents 11,059 1,061 5,065
Cash and cash equivalents at beginning of year 8,745 7,684 2,619
Cash and cash equivalents at end of year $ 19,804 $ 8,745 $ 7,684