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Note 10 - Income Taxes (Details Textual) - USD ($)	3 Months Ended			6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2019
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		$ 2,474,000				$ 2,503,000
Income Tax Expense (Benefit), Excluding Adjustment of Deferred Tax (Asset) Liability						$ 290,590
Effective Income Tax Rate Reconciliation, Percent, Total						20.05%	41.90%
Income Tax Expense (Benefit), Total	$ (73,749)		$ (435,726)	$ 2,793,590	$ (752,969)	$ 2,793,590	$ (752,969)
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 domestic federal statutory tax rate applicable to pretax income (loss).

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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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