Note 7 - Income Tax (Details Textual) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense (Benefit), Total	$ 321,986	$ 370,572	$ 536,681	$ 500,833	$ 504,446	$ 394,468	$ 284,000	$ 0	$ 1,730,072	$ 1,182,914
Prepaid Taxes	65,192								65,192
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Income Tax Expense									2,903,814
Deferred Tax Assets, Gross, Total	$ 32,822								32,822
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes Paid									$ 1,826,000	970,000
Accrued Income Taxes, Total					$ 212,914					$ 212,914