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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Current Assets:    
Allowance for doubtful accounts $ 646 $ 597
Noncurrent Assets:    
Accumulated depreciation, rental equipment 135,924 126,096
Accumulated depreciation, property and equipment 11,184 11,267
Accumulated amortization, intangibles $ 1,570 $ 1,508
Stockholders’ Equity:    
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 12,838,000 12,764,000
Common stock, shares outstanding 12,838,000 12,764,000