Note 15 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value Measurements at March 31,
	2019		2018
Marketable securities (Level 1)	$	3,212,587	$	2,552,774
Interest rate swaps (Level 2)	$	227,214	$	66,706
Acquisition contingent consideration obligations (Level 3)	$	488,905	$	1,955,987
Redeemable non-controlling interest (Level 3)	$	5,476,000	$	1,992,939

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Acquisition Contingent Consideration Obligations			Redeemable Non- Controlling Interest
Beginning Balance as of April 1, 2018	$	1,955,987		$	1,992,939
Payment of contingent consideration		(1,533,041	)		-
Contribution from non-controlling member		-			210,000
Distribution to non-controlling member		-			(75,508	)
Net income attributable to non-controlling interests		-			2,026,053
Fair value adjustment		-			1,322,516
Interest accrued on contingent consideration		65,959			-
Ending Balance as of March 31, 2019	$	488,905		$	5,476,000