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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current Assets:    
Allowance for doubtful accounts $ 711 $ 833
Noncurrent Assets:    
Accumulated depreciation, rental equipment 116,359 111,293
Accumulated depreciation, property and equipment 10,972 10,825
Accumulated amortization, intangibles $ 1,413 $ 1,382
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 12,708,000 12,603,000
Common stock, shares outstanding 12,708,000 12,603,000