Note 5 - Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Aug. 05, 2014
Note 5 - Variable Interest Entities (Details) [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates	$ 1,490
Noncontrolling Interest, Increase from Business Combination	(828)
Noncontrolling Interest [Member] | Crump Geyser Company [Member]
Note 5 - Variable Interest Entities (Details) [Line Items]
Noncontrolling Interest, Increase from Business Combination		1,000
Noncontrolling Interest [Member]
Note 5 - Variable Interest Entities (Details) [Line Items]
Noncontrolling Interest, Increase from Business Combination	(987)
Additional Paid-in Capital [Member] | Crump Geyser Company [Member]
Note 5 - Variable Interest Entities (Details) [Line Items]
Noncontrolling Interest, Increase from Business Combination		200
Additional Paid-in Capital [Member]
Note 5 - Variable Interest Entities (Details) [Line Items]
Noncontrolling Interest, Increase from Business Combination	159
Crump Geyser Company [Member]
Note 5 - Variable Interest Entities (Details) [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates		$ 1,500
Noncontrolling Interest, Ownership Percentage by Parent		50.00%