Note 3 - Significant Customers, Concentration of Credit Risk, and Geographic Information (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Debt, Current	0		0
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Outside North America [Member]
Concentration Risk, Percentage	56.30%	57.20%	52.80%	43.60%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 1 [Member]
Concentration Risk, Percentage	13.70%			12.30%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Concentration Risk, Percentage	13.50%			10.60%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage		13.20%	11.40%
Number of Major Customers Concentration Risk	2	1	1	2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer 1 [Member]
Concentration Risk, Percentage	21.40%			4.80%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Concentration Risk, Percentage	15.60%			21.40%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage		21.40%	15.60%