Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Mar. 31, 2020	Mar. 31, 2019
Stock based compensation	$ 2,943,816	$ 2,883,491
Net operating loss carryforward	10,625,357	9,960,339
Impairment of long-lived assets	975,461
Depreciation and Amortization expense	(324,707)	(416,944)
Other temporary items	136,243	68,520
Total deferred tax assets	14,356,170	12,495,406
Less valuation allowance	(14,356,170)	(12,495,406)
Net deferred tax asset

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from provisions, reserves, allowances, and accruals, classified as other.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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