Note 12 - Commitments and Contingencies (Details Textual)	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012
In Exchange For Services And Exclusivity Agreement [Member]
Other Liabilities, Noncurrent			$ 923,000
Water Project [Member]
Deferred Revenue			750,000
Operating Leases, Rent Expense			207,000	$ 202,000	$ 219,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months			$ 648,000
Loss Contingency, Pending Claims, Number					6	9
Loss Contingency, Claims Dismissed, Number	6				3
Loss Contingency Claims Appealed During Period Number		6