Note 8 - Basic and Diluted Net Income (Loss) Per Share (Details Textual) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted Average Number of Shares Outstanding, Basic, Total (in shares)	3,875,431	3,875,431	3,875,431	3,875,431
Weighted Average Number of Shares Outstanding, Assuming Dilution (in shares)		3,892,948		3,909,706