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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net revenues:        
Rentals $ 14,052 $ 14,769 $ 28,473 $ 29,906
Net revenues 16,415 16,942 32,898 34,596
Gross profit 9,553 10,341 19,626 20,990
Selling, general and administrative expenses:        
Provision for doubtful accounts 1,326 3,182
Total selling, general and administrative 9,757 $ 11,433 19,242 $ 24,051
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
Net revenues:        
Rentals 1,433   3,337  
Net revenues 1,433   3,337  
Gross profit 1,433   3,337  
Selling, general and administrative expenses:        
Provision for doubtful accounts 1,433   3,337  
Total selling, general and administrative 1,433   3,337  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Net revenues:        
Rentals 15,485   31,810  
Net revenues 17,848   36,235  
Gross profit 10,986   22,963  
Selling, general and administrative expenses:        
Provision for doubtful accounts 1,433   3,337  
Total selling, general and administrative $ 11,190   $ 22,579