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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES      
Net income $ 19,444 $ 28,239 $ 28,488
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation Expense 1,954 2,090 1,820
Gain on sale of equipment and property (31)    
(Accretion) of discount/ amortization of premium related to marketable securities   (5) 213
Stock-based compensation expense 3,102 2,123 2,089
Deferred income tax (benefit) provision (311) (620) 378
Pension settlement loss 647    
(Increase) decrease in assets:      
Accounts receivable 1,901 (2,735) (821)
Income taxes receivable 907 (455) 262
Inventories (757) 5,217 (8,764)
Prepaid expenses and other current assets 109 (261) 301
Other non-current assets (4,428) (1,355) (563)
Increase (decrease) in liabilities:      
Accounts payable 2,193 (787) (689)
Other accrued expenses 2,426 (386) (505)
Other long-term liabilities 2,718 2,852 566
Net cash provided by operating activities 29,874 33,917 22,775
INVESTING ACTIVITIES      
Capital expenditures (2,099) (2,334) (2,154)
Proceeds from sale of assets 34    
Sales and maturities of marketable securities   7,978 21,423
Purchases of marketable securities   (299) (16,209)
Net cash (used for) provided by investing activities (2,065) 5,345 3,060
FINANCING ACTIVITIES      
Payment of dividends (13,550) (19,756) (17,252)
Cash paid for common stock purchased and retired (2,490) (8,447) (7,522)
Net cash used for financing activities (16,040) (28,203) (24,774)
Net increase in cash and cash equivalents 11,769 11,059 1,061
Cash and cash equivalents at beginning of year 19,804 8,745 7,684
Cash and cash equivalents at end of year $ 31,573 $ 19,804 $ 8,745