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Note 2 - Sale of Subsidiary; Discontinued Operations (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Chem Free [Member] | Discontinued Operations, Disposed of by Sale [Member] | Restricted Cash and Cash Equivalents after Working Capital Adjustment [Member]                
Restricted Cash and Cash Equivalents, Current               $ 880,000
Chem Free [Member] | Discontinued Operations, Disposed of by Sale [Member] | Subsequent Event [Member]                
Proceeds from Divestiture of Interest in Consolidated Subsidiaries $ 2,200,000              
Chem Free [Member] | Discontinued Operations, Disposed of by Sale [Member]                
Disposal Group, Including Discontinued Operation, Consideration         $ 21,600,000      
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax         18,746,000      
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities               120,000
Increase in Restricted Cash         $ 3,300,000      
Restricted Cash and Cash Equivalents, Current   $ 2,200,000       $ 2,200,000   2,200,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax   $ (20,000)   $ 18,726,000 18,726,000
Restricted Cash and Cash Equivalents, Current   $ 2,200,000       $ 2,200,000   2,200,000
Disposal Group Including Discontinued Operation, Working Capital Adjustment               $ 220,000