Note 7 - Earnings Per Share (Details Textual) - shares	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	434,500	434,500
Class of Warrant or Right, Outstanding (in shares)	2,850,000		2,850,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	56,000
Antidilutive [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	346,500		144,500