Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Details)

v3.2.0.727
Significant accounting policies (Details)
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
shares
Jun. 30, 2015
USD ($)
item
shares
Jun. 30, 2014
USD ($)
item
shares
Cash, cash equivalents and short-term investments:        
Cash and cash equivalent investment portfolio, percentage 20.00%   20.00%  
Management fees     $ 16,000 $ 12,000
Accounts receivable:        
Accounts receivable, net $ 24,000   24,000  
Allowance for uncollectable accounts $ 1,600   $ 1,600  
Income (loss) per share:        
Shares not included in the computation of EPS | shares 6.2 5.3 6.2 5.3
Accounts receivable [Member] | Customer concentration [Member]        
Concentration Risk [Line Items]        
Number of customers | item     2  
Net sales [Member] | European-based concentration [Member]        
Concentration Risk [Line Items]        
Number of customers | item     3 2
Net sales [Member] | European-based concentration [Member] | Customer One [Member]        
Concentration Risk [Line Items]        
Risk percentage     58.00% 37.00%
Net sales [Member] | European-based concentration [Member] | Customer Two [Member]        
Concentration Risk [Line Items]        
Risk percentage     28.00% 63.00%
Net sales [Member] | European-based concentration [Member] | Customer Three [Member]        
Concentration Risk [Line Items]        
Risk percentage     14.00%