Note 10 - Borrowings Under the Senior Secured Revolving Credit Facility (Details)	3 Months Ended
	Mar. 31, 2016
Pricing Tier 1 [Member] | Minimum [Member]
Consolidated Leverage Ratio	4
Pricing Tier 1 [Member] | Eurodollar [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.75%
Pricing Tier 1 [Member]
Commitment Fee/Unused Line Fee	0.45%
Letter of Credit Fee	2.75%
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Pricing Tier 2 [Member] | Minimum [Member]
Consolidated Leverage Ratio	3.5
Pricing Tier 2 [Member] | Maximum [Member]
Consolidated Leverage Ratio	4
Pricing Tier 2 [Member] | Eurodollar [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.50%
Pricing Tier 2 [Member]
Commitment Fee/Unused Line Fee	0.40%
Letter of Credit Fee	2.50%
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Pricing Tier 3 [Member] | Minimum [Member]
Consolidated Leverage Ratio	3
Pricing Tier 3 [Member] | Maximum [Member]
Consolidated Leverage Ratio	3.5
Pricing Tier 3 [Member] | Eurodollar [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.25%
Pricing Tier 3 [Member]
Commitment Fee/Unused Line Fee	0.35%
Letter of Credit Fee	2.25%
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Pricing Tier 4 [Member] | Minimum [Member]
Consolidated Leverage Ratio	2.5
Pricing Tier 4 [Member] | Maximum [Member]
Consolidated Leverage Ratio	3
Pricing Tier 4 [Member] | Eurodollar [Member]
Debt Instrument, Interest Rate, Stated Percentage	1.00%
Pricing Tier 4 [Member]
Commitment Fee/Unused Line Fee	0.30%
Letter of Credit Fee	2.00%
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Pricing Tier 5 [Member] | Maximum [Member]
Consolidated Leverage Ratio	2.5
Pricing Tier 5 [Member] | Eurodollar [Member]
Debt Instrument, Interest Rate, Stated Percentage	0.75%
Pricing Tier 5 [Member]
Commitment Fee/Unused Line Fee	0.30%
Letter of Credit Fee	1.75%
Debt Instrument, Interest Rate, Stated Percentage	1.75%