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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Current Assets:    
Allowance for doubtful accounts $ 299 $ 291
Allowance for inventory obsolescence 19 19
Noncurrent Assets:    
Accumulated depreciation, rental equipment 168,466 165,428
Accumulated depreciation, property and equipment 11,665 11,556
Accumulated amortization, operating lease right of use assets 36  
Accumulated amortization, intangibles $ 1,789 $ 1,758
Stockholders’ Equity:    
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 13,133,000 13,005,000
Common stock, shares outstanding (in shares) 13,133,000 13,005,000