Note 6 - (Loss) Earnings per Share - Reconciliation of the Amounts Used in Calculating Basic and Diluted Net Loss per Common Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Loss available to common shareholders	$ (179,224)	$ 27,964	$ (578,679)	$ (11,194)
Loss available to common shareholders, shares (in shares)	11,211,760	11,201,760	11,207,145	11,201,760
Loss available to common shareholders, per share amount (in dollars per share)	$ (0.02)	$ 0	$ (0.05)	$ 0
Effect of dilutive stock options, shares (in shares)		391,423
Diluted net loss per common share	$ (179,224)	$ 27,964	$ (578,679)	$ (11,194)
Diluted net loss per common share, shares (in shares)	11,211,760	11,593,183	11,207,145	11,201,760
Diluted net loss per common share, per share amount (in dollars per share)	$ (0.02)	$ 0	$ (0.05)	$ 0
Effect of dilutive stock options (in shares)		391,423