Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies (Details Textual)

v3.7.0.1
Note 2 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Warranty Period     1 year    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]          
Concentration Risk, Percentage 37.00% 92.00% 26.00% 75.00%  
Concentration Risk, Number of Customers 3 2 2 2  
Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Concentration Risk, Percentage     65.00%   81.00%
Concentration Risk, Number of Customers     4   3