Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Details)

v2.4.0.8
Significant accounting policies (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Accounts receivable [Member]
Customer concentration [Member]
Dec. 31, 2013
Accounts receivable [Member]
Customer concentration [Member]
Mar. 31, 2014
Accounts receivable [Member]
Customer concentration [Member]
Customer One [Member]
Dec. 31, 2013
Accounts receivable [Member]
Customer concentration [Member]
Customer One [Member]
Mar. 31, 2014
Accounts receivable [Member]
Customer concentration [Member]
Customer Two [Member]
Dec. 31, 2013
Accounts receivable [Member]
Customer concentration [Member]
Customer Two [Member]
Mar. 31, 2014
Accounts receivable [Member]
Customer concentration [Member]
Customer Three [Member]
Mar. 31, 2014
Net sales [Member]
European-based concentration [Member]
Mar. 31, 2014
Net sales [Member]
European-based concentration [Member]
Customer One [Member]
Mar. 31, 2014
Net sales [Member]
European-based concentration [Member]
Customer Two [Member]
Cash, cash equivalents and short-term investments:                        
Cash and cash equivalent investment portfolio, percentage 10.00%                      
Unrealized gain $ 11,000                      
Unrealized loss   38,869                    
Realized gain                         
Realized loss 62,000                       
Management fees 4,600 3,893                    
Accounts receivable:                        
Accounts receivable, net 55,000                      
Allowance for uncollectable accounts $ 15,000                      
Concentration Risk [Line Items]                        
Risk percentage         28.00% 38.00% 49.00% 62.00% 23.00%   63.00% 37.00%
Number of customers     3 2           2    
Income (loss) per share:                        
Shares not included in the computation of EPS 5,308,000 1,774,000