Note 12 - Concentrations of Risk (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Accounts Receivable [Member]
Concentration Risk, Percentage	79.00%		77.00%
Number of Major Customers	2		3
Accounts Receivable [Member] | Customer Number 2 [Member]
Concentration Risk, Percentage	42.00%		17.00%
Accounts Receivable [Member] | Customer Number 1 [Member]
Concentration Risk, Percentage	37.00%		49.00%
Accounts Receivable [Member] | Customer Number 3 [Member]
Concentration Risk, Percentage			11.00%
Sales Revenue, Net [Member]
Number of Major Customers	2	2
Sales Revenue, Net [Member] | Customer Number 2 [Member]
Concentration Risk, Percentage	27.00%	13.00%
Sales Revenue, Net [Member] | Customer Number 1 [Member]
Concentration Risk, Percentage	31.00%	32.00%