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Condensed Consolidated Balance Sheets (unaudited) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 50,965,566 $ 44,067,477
Accounts receivable, net of reserves of $327,270 and $337,459 at March 31, 2013 and December 31, 2012, respectively 14,784,266 21,462,481
Inventories 9,947,961 8,283,472
Current portion deferred income taxes 1,989,422 2,031,583
Prepaid expenses and other 1,007,669 1,539,477
Total current assets 78,694,884 77,384,490
Property and equipment, at cost 51,566,576 52,376,013
Less: accumulated depreciation (17,087,726) (17,263,032)
Property, Plant and Equipment, Net, Total 34,478,850 35,112,981
Long-term deposits and other 162,545 171,053
Intangible assets, net 19,229,922 20,334,636
Goodwill 8,792,165 9,065,891
Total Assets 141,358,366 142,069,051
Current liabilities:    
Accounts payable 2,696,550 2,341,838
Accrued expenses 4,252,574 5,837,044
Deferred revenue 2,191,667 2,875,067
Current portion of long-term debt 1,600,000 1,600,000
Income taxes payable   1,798,669
Total current liabilities 10,740,791 14,452,618
Other long-term liabilities 1,294,140 1,541,124
Long-term deferred revenue 2,111,111 2,152,778
Deferred tax liability 6,784,019 6,997,397
Long-term debt 7,600,000 8,000,000
Commitments and contingencies (Note 10)      
Stockholders' equity:    
Preferred stock, $.01 par value; 1,250,000 shares authorized, no shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively      
Common stock, $.01 par value; 30,000,000 shares authorized, 14,006,135 and 13,866,060 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively 140,061 138,659
Additional paid-in-capital 67,014,641 65,431,424
Accumulated currency translation adjustment (3,404,080) (2,654,630)
Retained earnings 49,077,683 46,009,681
Total stockholders' equity 112,828,305 108,925,134
Total Liabilities and Stockholders' Equity $ 141,358,366 $ 142,069,051