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Condensed Consolidated Balance Sheets (USD $)
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 38,232,943 $ 33,479,519
Receivables, less allowance for doubtful accounts of $483,722 at September 30, 2013 and $494,891 at December 31, 2012 17,806,326 17,835,902
Inventories 9,897,219 9,695,060
Prepaid expenses 927,663 653,916
Refundable income taxes   1,713,687
Deferred income taxes 1,130,677 1,115,959
Total current assets 67,994,828 64,494,043
Property, plant, and equipment 64,550,643 59,569,202
Less accumulated depreciation and amortization (38,874,322) (36,250,906)
Net property, plant, and equipment 25,676,321 23,318,296
Goodwill 7,322,131 7,038,631
Intangible assets, net 1,465,741 2,083,941
Other assets 1,881,231 1,682,529
Total assets 104,340,252 98,617,440
Current liabilities:    
Accounts payable 3,559,245 4,088,003
Accrued expenses 5,844,417 7,592,842
Current installments of long-term debt 1,552,090 1,550,190
Total current liabilities 10,955,752 13,231,035
Long-term debt, excluding current installments 7,735,917 8,313,709
Deferred income taxes 1,593,704 1,589,654
Retirement and other liabilities 2,464,314 2,222,238
Total liabilities 22,749,687 25,356,636
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $.01 par value. Authorized 1,000,000 shares; no shares issued or outstanding      
Common stock, $.01 par value. Authorized 20,000,000 shares; issued and outstanding 6,883,441 at September 30, 2013, and 6,749,913 at December 31, 2012 68,834 67,499
Additional paid-in capital 19,668,350 19,238,934
Retained earnings 61,853,381 53,954,371
Total stockholders' equity 81,590,565 73,260,804
Total liabilities and stockholders' equity $ 104,340,252 $ 98,617,440