Note 8 - Stock Options (Details) - Share-based Compensation, Stock Options, Activity - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation, Stock Options, Activity [Abstract]
Options Outstanding, Shares	67,879		67,879
Options Outstanding, Weighted- Average Exercise Price	$ 21.40		$ 21.40
Options Outstanding, Weighted- Average Remaining Contractual Term	3 years 153 days	4 years 62 days	5 years 62 days
Options Outstanding, Aggregate Intrinsic Value		$ 0	$ 0
Options Exercisable, Shares	67,879
Options Exercisable, Weighted- Average Exercise Price	$ 21.40
Options Exercisable, Weighted- Average Remaining Contractual Term	3 years 153 days
Options Exercisable, Aggregate Intrinsic Value	$ 0
Options Granted, Shares	0	0
Options Granted, Weighted- Average Exercise Price	$ 0	$ 0
Options Cancelled, Shares	0	0
Options Cancelled, Weighted- Average Exercise Price	$ 0	$ 0
Options Outstanding, Shares	67,879	67,879
Options Outstanding, Weighted- Average Exercise Price	$ 21.40	$ 21.40