Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member]
Property, Plant and Equipment, Useful Life	1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life	10 years
Thermal Products and Mechanical Products [Member]
Equipment Leased To Customers Initial Term	180 days
Provision for Doubtful Accounts	$ 0	$ 0
Inventory Write-down	342,000	344,000
Depreciation	465,000	524,000
Foreign Currency Transaction Gain (Loss), before Tax	$ (33,000)	$ (44,000)