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Note 13 - Significant Risks and Uncertainties
 12 Months Ended
Dec. 31, 2015
Notes to Financial Statements  
Concentration Risk Disclosure [Text Block]
Note 1
3
–
Significant Risks and Uncertainties
 
Cash
and Cash Equivalents
 
The Company places most of its temporary cash investments with financial institutions, which from time to time may exceed the Federal Deposit Insurance Corporation limit. The amount at
risk at December 31, 2015 and at December 31, 2014 was $11,966,000 and $10,216,000
respectively.
 
Sales Concentrations
 
Revenue to a single customer in any one year can exceed 10.0% of our total sales. One customer represented 49.6% and 50.2% respectively, of our annual revenues in fiscal years 2015 and 2014. Another customer represented 13.7% of our revenue in 2015. The loss of current key customers would have to be replaced by others, and our inability to do so may have a material adverse effect on our business and financial condition.
 
Export sales to unaffiliated customers represented approximately 9.0% and 20.2% of sales for the years ended December 31, 2015 and 2014, respectively. Export sales in both 2015 and 2014 were primarily to customers in Europe and Asia. All contracts are denominated in U.S. dollars. The Company does not enter into any foreign exchange contracts.