Note 12 - Concentrations of Risk (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Accounts Receivable [Member]
Concentration Risk, Percentage			33.00%		59.00%
Number of Major Customers			2		3
Accounts Receivable [Member] | Customer Number 1 [Member]
Concentration Risk, Percentage			20.00%		38.00%
Accounts Receivable [Member] | Customer Number 2 [Member]
Concentration Risk, Percentage			13.00%		12.00%
Accounts Receivable [Member] | Customer Number 3 [Member]
Concentration Risk, Percentage					9.00%
Sales Revenue, Net [Member]
Concentration Risk, Percentage	46.00%	28.00%	45.00%	24.00%
Number of Major Customers	2	1	2	1
Sales Revenue, Net [Member] | Customer Number 1 [Member]
Concentration Risk, Percentage	32.00%		32.00%
Sales Revenue, Net [Member] | Customer Number 2 [Member]
Concentration Risk, Percentage	14.00%		13.00%