Note 13 - Geographical Information - Long-lived Assets By Geographic Region (Details) - USD ($)	Jun. 30, 2018	Mar. 31, 2018
Non-current Assets	$ 19,417,752	$ 20,273,171
UNITED STATES
Non-current Assets	5,357,615	5,209,831
AUSTRALIA
Non-current Assets	4,793
Non-US [Member]
Non-current Assets	14,060,137	15,063,340
MEXICO
Non-current Assets	3,934,399	4,352,257
ROMANIA
Non-current Assets	3,459,673	3,626,136
NETHERLANDS
Non-current Assets	$ 6,661,272	$ 7,084,947