Note 5 - Concentration of Revenue (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Customer A [Member] | Sales Revenue, Net [Member]
Concentration risk	22.50%	24.70%
Customer A [Member] | Accounts Receivable [Member]
Concentration risk	23.60%	37.10%
Customer B [Member] | Sales Revenue, Net [Member]
Concentration risk	18.70%	12.70%
Customer B [Member] | Accounts Receivable [Member]
Concentration risk	6.40%
Customer C [Member] | Sales Revenue, Net [Member]
Concentration risk	2.00%
Customer C [Member] | Accounts Receivable [Member]
Concentration risk	28.90%
Customer D [Member] | Sales Revenue, Net [Member]
Concentration risk	3.90%	6.20%
Customer D [Member] | Accounts Receivable [Member]
Concentration risk	11.60%	15.40%