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Note 5 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Net income	$ 868,963	$ 1,273,619	$ 1,273,619
Numerator for basic and diluted earnings per share	$ 868,963	$ 1,273,619
Denominator for basic earnings per share – weighted-average shares (in shares)	9,009,752	9,264,446	9,264,446
Effect of dilutive securities:
Effect of dilutive securities (in shares)	285	365
Denominator for diluted earnings per share – weighted-average shares (in shares)	9,010,037	9,264,811	9,264,811
Basic earnings per share (in dollars per share)	$ 0.10	$ 0.14	$ 0.14
Diluted earnings per share (in dollars per share)	$ 0.10	$ 0.14	$ 0.14
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	285	365

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