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Note 8 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	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	$ 234,888
Effective Income Tax Rate Reconciliation, Percent	22.90%	37.40%
Income Tax Expense (Benefit)	$ 2,708,888	$ (486,528)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 0
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%

X

- 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.

+ References

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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