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Condensed Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current Assets:    
Allowance for doubtful accounts $ 816 $ 507
Noncurrent Assets:    
Accumulated depreciation, rental equipment 103,090 106,179
Accumulated depreciation, property and equipment 10,863 10,830
Accumulated amortization, intangibles $ 1,320 $ 1,257
Stockholders' Equity Attributable to Parent [Abstract]    
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, shares authorized 30,000,000 30,000,000
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares issued 12,584,000 12,466,000
Common stock, shares outstanding 12,584,000 12,466,000