Note 8 - Equipment Leasing (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Thermal Products and Mechanical Products [Member]
Equipment Leased To Customers Initial Term	180 days
Equipment Leased to Other Party [Member]
Machinery and Equipment, Gross	$ 338	$ 692
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	124	167
Operating Leases, Future Minimum Payments Receivable, Current	55
Machinery and Equipment, Gross	4,377	4,322
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 3,868	$ 3,647