Note 6 - Earnings Per Share - Weighted Average Shares Outstanding (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Basic earnings per common share:
Net income	$ 30,532	$ 329,210
Weighted average basic shares outstanding (in shares)	35,588,775	35,308,668
Basic income per common share (in dollars per share)		$ 0.01
us-gaap_EarningsPerShareDilutedAbstract
Net income allocable to common shareholders	$ 30,532	$ 329,210
Weighted average basic shares outstanding (in shares)	35,588,775	35,308,668
Diluted effect:
Stock options (in shares)		69,000
Weighted average dilutive shares outstanding (in shares)	35,629,951	35,589,877
Dilutive income per common share (in dollars per share)		$ 0.01
Restricted Stock [Member]
Diluted effect:
Stock options (in shares)	41,176	212,209