Statements of Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Additional Paid-in Capital [Member]
Common stock per share (in dollars per share)					$ 1	$ 1
Common stock per share (in dollars per share)	$ 1	$ 1	$ 1	$ 1