Note 10 - Long-term Debt (Details) - Borrowings Under the Senior Secured Revolving Credit Facility	3 Months Ended
	Mar. 31, 2015
Minimum [Member] | Pricing Tier 1 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	2.50
Minimum [Member] | Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	2.00
Minimum [Member] | Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	1.50
Minimum [Member] | Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	1.00
Maximum [Member] | Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	2.50
Maximum [Member] | Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	2.00
Maximum [Member] | Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	1.50
Maximum [Member] | Pricing Tier 5 [Member]
Guarantor Obligations [Line Items]
Consolidated Leverage Ratio	1.00
Eurodollar [Member] | Pricing Tier 1 [Member]
Guarantor Obligations [Line Items]
Rate Loans	3.75%
Eurodollar [Member] | Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Rate Loans	3.50%
Eurodollar [Member] | Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Rate Loans	3.25%
Eurodollar [Member] | Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Rate Loans	3.00%
Eurodollar [Member] | Pricing Tier 5 [Member]
Guarantor Obligations [Line Items]
Rate Loans	2.75%
Base Rate [Member] | Pricing Tier 1 [Member]
Guarantor Obligations [Line Items]
Rate Loans	2.75%
Base Rate [Member] | Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Rate Loans	2.50%
Base Rate [Member] | Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Rate Loans	2.25%
Base Rate [Member] | Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Rate Loans	2.00%
Base Rate [Member] | Pricing Tier 5 [Member]
Guarantor Obligations [Line Items]
Rate Loans	1.75%
Pricing Tier 1 [Member]
Guarantor Obligations [Line Items]
Commitment Fee/Unused Line Fee	0.50%
Letter of Credit Fee	3.75%
Pricing Tier 2 [Member]
Guarantor Obligations [Line Items]
Commitment Fee/Unused Line Fee	0.45%
Letter of Credit Fee	3.50%
Pricing Tier 3 [Member]
Guarantor Obligations [Line Items]
Commitment Fee/Unused Line Fee	0.40%
Letter of Credit Fee	3.25%
Pricing Tier 4 [Member]
Guarantor Obligations [Line Items]
Commitment Fee/Unused Line Fee	0.35%
Letter of Credit Fee	3.00%
Pricing Tier 5 [Member]
Guarantor Obligations [Line Items]
Commitment Fee/Unused Line Fee	0.30%
Letter of Credit Fee	2.75%