Note 10 - Commitments and Contingencies (Details) (USD $)	9 Months Ended
	Sep. 30, 2013 ft
Note 10 - Commitments and Contingencies (Details) [Line Items]
Installation of a reactive iron wall covering area (in Feet)	250
Environmental Remediation Estimated Initial Construction Cost (in Dollars)	$ 688,000
Environmental Remediation Expense Expected To Be Incurred (in Dollars)	$ 1,997,000
Estimated period	30 years
Unresolved cases	32
Massachusetts [Member]
Note 10 - Commitments and Contingencies (Details) [Line Items]
Loss Contingency, Pending Claims, Number	234
Loss Contingency, Claims Settled and Dismissed, Number	35
Number of cases terminated	167
Washington [Member]
Note 10 - Commitments and Contingencies (Details) [Line Items]
Loss Contingency, Pending Claims, Number	1