Note 6 - Leases (Details Textual) - USD ($)	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Operating Lease, Remaining Lease Term	8 years 109 days
Operating Lease, Expense	$ 23,000	$ 38,000
Operating Lease, Liability, Current	$ 68,588