Note 4 - Restricted Cash - Cash, Cash Equivalent and Restricted Cash (Details) - USD ($)		Jun. 30, 2018	Mar. 31, 2018		Jun. 30, 2017	Mar. 31, 2017
Cash and cash equivalents	[1]	$ 5,746,521	$ 4,803,238	[2]
Restricted Cash		18,832	269,659
Total cash, cash equivalents and restricted cash shown in the statement of cash flows		$ 5,765,353	$ 5,072,897		$ 1,888,824	$ 2,763,365

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

[2] Derived from audited consolidated financial statements