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Condensed Balance Sheets (USD $)
Sep. 30, 2012
Dec. 31, 2011
Current Assets:    
Cash and cash equivalents $ 30,924,000 $ 16,390,000
Trade accounts receivable, net of allowance for doubtful accounts of $434 and $296, respectively 3,731,000 5,679,000
Inventory, net of allowance for obsolescence of $816 and $486, respectively 26,652,000 26,965,000
Prepaid income taxes 167,000 109,000
Prepaid expenses and other 481,000 360,000
Total current assets 61,955,000 49,503,000
Rental equipment, net of accumulated depreciation of $66,543 and $56,623, respectively 148,104,000 142,473,000
Property and equipment, net of accumulated depreciation of $8,597 and $7,786, respectively 7,811,000 7,839,000
Goodwill, net of accumulated amortization of $325, both periods 10,039,000 10,039,000
Intangibles, net of accumulated amortization of $2,030 and $1,936, respectively 2,189,000 2,282,000
Other assets 30,000 28,000
Total assets 230,128,000 212,164,000
Current Liabilities:    
Accounts payable 2,059,000 3,730,000
Accrued liabilities 8,774,000 3,644,000
Current income tax liability 75,000 75,000
Deferred income 3,505,000 4,863,000
Total current liabilities 14,413,000 12,312,000
Line of credit, non-current portion 927,000 1,017,000
Deferred income tax liability 42,385,000 36,769,000
Other long-term liabilities 507,000 524,000
Total liabilities 58,232,000 50,622,000
Commitments and contingencies (Note 8)      
Stockholders’ Equity:    
Preferred stock, 5,000 shares authorized, no shares issued or outstanding 0 0
Common stock, 30,000 shares authorized, par value $0.01; 12,237 and 12,179 shares issued and outstanding, respectively 122,000 122,000
Additional paid-in capital 88,465,000 87,225,000
Retained earnings 83,309,000 74,195,000
Total stockholders' equity 171,896,000 161,542,000
Total liabilities and stockholders' equity $ 230,128,000 $ 212,164,000