Note 16 - Defined Contribution Retirement Plan (Details Textual)	12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Defined Contribution Plan, Service Period for Eligibility	1 year
Defined Contribution Plan, Employee, Eligible Age	18
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Defined Contribution Plan, Cost	$ 145,082	$ 120,862