Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 13,066,000	$ 11,349,000
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	3,873,000	3,839,000
Provision for bad debts - accounts receivable	266,000	197,000
Share-based compensation expense	1,361,000	1,404,000
Deferred income tax (benefit) provision	(1,216,000)	1,000
(Gain) on disposals of property, plant and equipment	(1,000)	$ (91,000)
Adjustment to acquisition-related contingent liability	(200,000)
Accretion of acquisition-related contingent liability	119,000	$ 128,000
Changes in assets and liabilities:
Accounts receivable - trade	(2,224,000)	(5,418,000)
Accounts receivable - other	873,000	(2,000)
Inventories	(5,291,000)	(8,796,000)
Prepaid expenses and other current assets	(1,717,000)	1,515,000
Other assets	(1,803,000)	18,000
Accounts payable	2,069,000	1,343,000
Other current liabilities	(631,000)	1,180,000
Long-term pension liability	(112,000)	216,000
Other long-term liabilities	(80,000)	(45,000)
Net cash provided from operating activities	8,352,000	6,838,000
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property, plant and equipment	(8,069,000)	(4,936,000)
Proceeds from disposals of property, plant and equipment	24,000	128,000
Net cash used in investing activities	(8,045,000)	(4,808,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	67,331,000	55,117,000
Repayment of long-term debt	(68,416,000)	(56,332,000)
Payment of cash dividends	(4,255,000)	$ (3,663,000)
Payment of contingent liability	(1,200,000)
Proceeds received on exercise of stock options	1,840,000	$ 1,855,000
Excess tax benefit from exercise of stock options and SARS	843,000	263,000
Net cash used in financing activities	(3,857,000)	(2,760,000)
Net decrease in cash and cash equivalents	(3,550,000)	(730,000)
Cash and cash equivalents balance, beginning of year	4,586,000	5,316,000
Cash and cash equivalents balance, end of year	$ 1,036,000	$ 4,586,000