Note 9 - Basic and Diluted Net Income (Loss) Per Share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Weighted Average Number of Shares Outstanding, Basic, Total (in shares)	3,899,431	3,875,431	3,899,431	3,875,431
Weighted Average Number of Shares Outstanding, Diluted, Total (in shares)	3,928,971	3,875,000	3,936,854	3,875,000