Note 20 - Income Taxes - Provision for Income Taxes (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Current:
Federal	$ 2,225,000	$ (133,000)
State	418,000	183,000
Foreign	23,000	156,000
Total current	2,666,000	206,000
Deferred:
Federal	(1,105,000)	(14,000)
State	(58,816)	3,000
Total deferred	(1,158,945)	(10,566)
Total	$ 1,502,184	$ 195,000