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Note 10 - Income Taxes (Details Textual) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2019
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 2,474,000
Income Tax Expense (Benefit), Excluding Adjustment of Deferred Tax (Asset) Liability				$ 393,339
Effective Income Tax Rate Reconciliation, Percent, Total				25.10%	38.10%
Income Tax Expense (Benefit), Total	$ 158,451		$ 169,285	$ 2,867,339	$ (317,243)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total				$ 0
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						21.00%

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- Definition

Represents the amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, excluding any amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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