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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Current Assets:    
Allowance for doubtful accounts $ 443,000 $ 569,000
Allowance for inventory obsolescence 20,785 15,000
Noncurrent Assets:    
Accumulated depreciation, rental equipment 155,989,000 145,851,000
Accumulated depreciation, property and equipment 11,176,000 11,274,000
Accumulated amortization, intangibles $ 1,695,000 $ 1,632,000
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, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 12,968,000 12,880,000
Common stock, shares outstanding 12,968,000 12,880,000