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Consolidated Statement of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income from consolidated operations $ 11,276 $ 10,895 $ 10,784
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 4,084 2,928 2,781
Loss (gain) on sales of property, plant, and equipment 11 (12) (838)
Share-based compensation 924 860 1,089
Stock issued in lieu of compensation     55
Deferred income taxes 740 610 452
Excess tax benefits on share-based compensation (818) (832) (700)
Changes in operating assets and liabilities, net of effects from acquisition:      
Receivables, net 804 (842) (985)
Inventories (1,353) 801 (1,714)
Prepaid expenses (36) (65) 476
Refundable income taxes 994 (695) 327
Accounts payable (1,007) 384 507
Accrued expenses 1,272 2,143 (440)
Retirement and other liabilities (417) 190 (12)
Other assets (368) (203) (66)
Net cash provided by operating activities 16,106 16,162 11,716
Cash flows from investing activities:      
Additions to property, plant, and equipment (5,830) (11,994) (3,741)
Holdback payment related to the acquisition of Packaging Alternatives Corporation (PAC) (600)    
Redemption of cash value life insurance 37    
Acquisition of PAC net of cash acquired   (3,596)  
Proceeds from sale of property, plant, and equipment 1 86 1,223
Net cash used in investing activities (6,392) (15,504) (2,518)
Cash flows from financing activities:      
Distribution to United Development Company Partners (non-controlling interest)   (1,196) (290)
Excess tax benefits on share-based compensation 818 832 700
Proceeds from the exercise of stock options, net of attestations 191 365 251
Principal repayment of long-term debt (6,601) (740) (1,282)
Payment of statutory withholding for stock options exercised and restricted stock units vested (879) (672) (830)
Proceeds from long-term borrowings 580 4,384  
Net cash provided by (used in) financing activities (5,891) 2,973 (1,451)
Net change in cash and cash equivalents 3,823 3,631 7,747
Cash and cash equivalents at beginning of year 33,480 29,849 22,102
Cash and cash equivalents at end of year $ 37,303 $ 33,480 $ 29,849