Note 6 - Stockholders' Equity - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Outstanding, Shares (in shares)	18,000
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 13.22
Granted, Shares (in shares)	3,250	2,750
Granted, Weighted Average Exercise Price (in dollars per share)	$ 7.15
Exercised, Shares (in shares)	0	0
Exercised, Weighted Average Exercise Price (in dollars per share)
Expired and forfeited, Shares (in shares)	(2,000)
Expired and forfeited, Weighted Average Exercise Price (in dollars per share)	$ 21.69
Outstanding, Shares (in shares)	19,250	18,000
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.32	$ 13.22
Exercisable, Shares (in shares)	13,415
Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 12.83