Note 17 - Segment Reporting (Details) - Segment Revenue by Customer (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
USEC [Member] \| Treatment [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 9,309,000	$ 2,037,000
USEC [Member] \| Services [Member]
Revenue, Major Customer [Line Items]
Revenues	963,000
USEC [Member]
Revenue, Major Customer [Line Items]
Revenues	10,272,000	2,037,000
CH Plateau Remediation Company [Member] \| Treatment [Member]
Revenue, Major Customer [Line Items]
Revenues	5,594,000	2,268,000
CH Plateau Remediation Company [Member] \| Services [Member]
Revenue, Major Customer [Line Items]
Revenues	168,000	17,654,000
CH Plateau Remediation Company [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 5,762,000	$ 19,922,000