Note 7 - Equity Investment (Details Textual) (M W L [Member], USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Equity Method Investment, Ownership Percentage	45.00%
Revenue from Related Parties	$ 2,000,000us-gaap_RevenueFromRelatedParties	$ 1,700,000us-gaap_RevenueFromRelatedParties
Percentage Owned by Non-related Party [Member]
Equity Method Investment, Ownership Percentage	55.00%
Trade Accounts Receivable [Member]
Due from Affiliates	880,000
Current Accounts Receivable [Member]
Due to Affiliate	$ 2,900,000

For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References+ Details

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References+ Details

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References+ Details