Note 4 - Other Intangible Assets (Details) - USD ($)	12 Months Ended
Note 4 - Other Intangible Assets (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Patents [Member] \| Minimum [Member]
Useful Lives	8 years
Patents [Member] \| Maximum [Member]
Useful Lives	18 years
Patents [Member]
Gross Carrying Amount	$ 539,000	$ 512,000
Accumulated Amortization	(203,000)	(168,000)
Net Carrying Amount	$ 336	344
Computer Software, Intangible Asset [Member]
Useful Lives	3 years
Gross Carrying Amount	$ 395,000	375,000
Accumulated Amortization	(364,000)	(319,000)
Net Carrying Amount	$ 31	56
Customer Relationships [Member]
Useful Lives	12 years
Gross Carrying Amount	$ 3,370,000	3,370,000
Accumulated Amortization	(1,671,000)	(1,335,000)
Net Carrying Amount	$ 1,699	2,035
Permits [Member]
Useful Lives	10 years
Gross Carrying Amount	$ 545,000	545,000
Accumulated Amortization	(373,000)	(318,000)
Net Carrying Amount	172	227
Gross Carrying Amount	4,849,000	4,802,000
Accumulated Amortization	(2,611,000)	(2,140,000)
Net Carrying Amount	$ 2,238	$ 2,662