Note 5 - Commitments and Contingencies (Details Textual) - Settlement Agreement [Member] - USD ($) $ in Thousands					3 Months Ended	9 Months Ended
	Nov. 30, 2021	Oct. 29, 2021	Sep. 30, 2021	Sep. 23, 2021	Sep. 30, 2021	Sep. 30, 2021
Litigation Settlement, Amount Awarded to Other Party				$ 2,100
Payments for Legal Settlements			$ 692
Payments for Legal Settlements			$ 692
Forecast [Member]
Payments for Legal Settlements	$ 692
Payments for Legal Settlements	$ 692
Subsequent Event [Member]
Payments for Legal Settlements		$ 692
Payments for Legal Settlements		$ 692
Other Expense [Member]
Litigation Settlement, Amount Awarded to Other Party					$ 2,100	$ 2,100