Note 15 - Geographical Information - Long-lived Assets By Geographic Region (Details) - USD ($)	Sep. 30, 2018	Mar. 31, 2018
Non-current Assets	$ 37,071,213	$ 20,273,171
UNITED STATES
Non-current Assets	5,224,050	5,209,831
AUSTRALIA
Non-current Assets	5,246
Non-US [Member]
Non-current Assets	31,847,163	15,063,340
UNITED KINGDOM
Non-current Assets	5,142
CANADA
Non-current Assets	17,993
MEXICO
Non-current Assets	3,516,541	4,352,257
ROMANIA
Non-current Assets	3,293,210	3,626,136
NETHERLANDS
Non-current Assets	6,202,377	7,084,947
CHINA
Non-current Assets	$ 18,806,654