Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Revenue Recognition - Impact of ASC 606 On the Condensed Consolidated Statements of Operations (Unaudited) (Details)

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Note 2 - Revenue Recognition - Impact of ASC 606 On the Condensed Consolidated Statements of Operations (Unaudited) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net revenues:    
Rentals $ 14,421 $ 15,137
Net revenues 16,483 17,654
Gross profit 10,073 10,649
Selling, general and administrative expenses:    
Provision for doubtful accounts 1,856
Total selling, general and administrative 9,485 $ 12,618
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]    
Net revenues:    
Rentals 1,904  
Net revenues 1,904  
Gross profit 1,904  
Selling, general and administrative expenses:    
Provision for doubtful accounts 1,904  
Total selling, general and administrative 1,904  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Net revenues:    
Rentals 16,325  
Net revenues 18,387  
Gross profit 11,977  
Selling, general and administrative expenses:    
Provision for doubtful accounts 1,904  
Total selling, general and administrative $ 11,389