Note 4 - Restricted Cash - Cash, Cash Equivalent and Restricted Cash (Details) - USD ($)		Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017
Cash and cash equivalents (Delphax $314,481 and $241,430)**	[1]	$ 5,612,472	$ 4,803,238
Restricted cash		18,865	269,659
Total cash, cash equivalents and restricted cash shown in the statement of cash flows		$ 5,631,337	$ 5,072,897	$ 2,249,288	$ 3,653,734

[1] Amounts related to Delphax as of September 30, 2018 and March 31, 2018, respectively.