Note 5 - Shareholders' Equity - Option Activity (Details)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Outstanding, beginning of period (in shares) | shares	195,160
Outstanding, beginning of period, weighted average exercise price (in dollars per share) | $ / shares	$ 1.00
Granted (in shares) | shares	0
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 1.00
Cancelled/Expired (in shares) | shares	0
Cancelled/Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 1.00
Exercised/Issued (in shares) | shares	(195,160)
Exercised/Issued, weighted average exercise price (in dollars per share) | $ / shares	$ 1.00
Outstanding, end of period (in shares) | shares	0
Outstanding, end of period, weighted average exercise price (in dollars per share) | $ / shares	$ 1.00
Exercisable (in shares) | shares	0
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 1.00