Note 7 - Income Tax - Provision for Income Tax (Details) - 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
Current									$ 1,765,556	$ 1,182,914
Deferred									(605,928)	(36,695)
Current
Deferred
Change in valuation allowance									570,444	36,695
Income tax provision	$ 321,986	$ 370,572	$ 536,681	$ 500,833	$ 504,446	$ 394,468	$ 284,000	$ 0	$ 1,730,072	$ 1,182,914