Note 21 - Employee Benefits (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 630,000	$ 559,000
General and Administrative Expense [Member]
Other Labor-related Expenses	$ 2,434,000	$ 1,188,000