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Condensed Consolidated Balance Sheets (USD $)
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 34,271,349 $ 33,479,519
Receivables, net 18,661,946 17,835,902
Inventories 10,890,988 9,695,060
Prepaid expenses 1,194,366 653,916
Refundable income taxes   1,713,687
Deferred income taxes 1,125,771 1,115,959
Total current assets 66,144,420 64,494,043
Property, plant, and equipment 63,086,429 59,569,202
Less accumulated depreciation and amortization (38,001,186) (36,250,906)
Net property, plant, and equipment 25,085,243 23,318,296
Goodwill 7,322,131 7,038,631
Intangible assets, net 1,585,141 2,083,941
Other assets 1,788,044 1,682,529
Total assets 101,924,979 98,617,440
Current liabilities:    
Accounts payable 3,979,896 4,088,003
Accrued expenses 5,826,209 7,592,842
Current installments of long-term debt 1,547,985 1,550,190
Total current liabilities 11,354,090 13,231,035
Long-term debt, excluding current installments 8,125,688 8,313,709
Deferred income taxes 1,592,354 1,589,654
Retirement and other liabilities 2,425,641 2,222,238
Total liabilities 23,497,773 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 6,803,853 at June 30, 2013, and 6,749,913 at December 31, 2012 68,039 67,499
Additional paid-in capital 19,392,331 19,238,934
Retained earnings 58,966,836 53,954,371
Total stockholders' equity 78,427,206 73,260,804
Total liabilities and stockholders' equity $ 101,924,979 $ 98,617,440