Note 2 - Sale of Subsidiary; Discontinued Operations - Discontinued Operations, Major Components of Assets and Liabilities (Details) - Chem Free [Member] - Discontinued Operations, Disposed of by Sale [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accrued Payroll [Member]
Major classes of liabilities included as part of discontinued operations:
Accrued payroll		$ 152
Accounts receivable		1,276
Inventories		1,042
Property, plant & equipment		488
Other assets		206
Total assets of discontinued operations		3,012
Accounts payable		190
Other current liabilities	$ 181	284
Other liabilities		212
Total liabilities of discontinued operations	$ 181	$ 838