Note 12 - Financing Arrangements - Components of Net Interest Expense (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Contractual interest	$ 3,290,788	$ 1,695,898
Amortization of deferred financing costs	224,169	90,028
Interest income	(57,628)	(61,154)
Interest Expense, Total	$ 3,427,102	$ 1,724,771