CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income	$ 40,345	$ 38,793	$ 37,284
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,961	11,572	11,362
Share-based compensation	3,002	3,304	3,099
Deferred income taxes, including change in valuation allowance	593	252	1,665
Other, net	494	(116)	0
Changes in operating assets and liabilities:
Receivables, net	(16,173)	(2,134)	(4,450)
Inventory	(3,886)	(28,162)	(15,620)
Prepaid expenses	(748)	(728)	862
Income taxes payable (refundable)	1,750	(275)	1,268
Accounts payable	1,817	2,107	(2,542)
Accrued expenses	11,503	(4,547)	551
Deferred credits	963	(332)	(586)
Other, net	634	(12)	588
Net cash provided by operating activities	53,255	19,722	33,481
Cash Flows from Investing Activities
Additions to property, plant, and equipment	(19,701)	(16,730)	(31,046)
Acquisition of business	(2,750)	0	0
Proceeds from sale of property and other	2,906	0	0
Other, net	(102)	(1,201)	0
Net cash used in investing activities	(19,647)	(17,931)	(31,046)
Cash Flows from Financing Activities
Payment of dividends and dividend equivalents	(8,188)	(6,856)	(5,500)
Purchase of treasury stock	(4,411)	(5,489)	(2,324)
Loan fees incurred with borrowings	(1,148)	0	0
Proceeds from long-term debt	0	20,000	0
Principal payments on long-term debt	(1,208)	(386)	(372)
Proceeds from credit agreement - revolver	54,700	17,440	28,966
Payments on credit agreement - revolver	(55,000)	(28,140)	(21,264)
Other, net	0	(76)	0
Net cash used in financing activities	(15,255)	(3,507)	(494)
Increase (decrease) in cash and cash equivalents	18,353	(1,716)	1,941
Cash and cash equivalents, beginning of year	3,309	5,025	3,084
Cash and cash equivalents, end of year	$ 21,662	$ 3,309	$ 5,025