Note 7 - Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
	May 02, 2018	Jun. 30, 2022	Jul. 31, 2022
EPA Case Involving a Housing Redevelopment Project in Newark, New Jersey [Member]
Loss Contingency, Percentage of Plaintiff's Costs for Which Reimbursement is Demanded	100.00%
Loss Contingency, Damages Sought, Value	$ 2.7
Litigation Settlement, Amount Awarded to Other Party		$ 1.5
Litigation Settlement, Expense		$ 0.8
Great Notch Condominium Claims[Member]
Loss Contingency, Damages Sought, Value			$ 119.5
Spill Fund Lawsuit [Member]
Loss Contingency, Damages Sought, Value			$ 5.3