Note 11 - Long-Term Debt (Details) (USD $)						3 Months Ended		3 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended					3 Months Ended			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2014 Scenario, Forecast [Member] Maximum [Member] Revolver [Member]	Mar. 31, 2014 Scenario, Actual [Member] Revolver [Member]	Mar. 31, 2014 Additional Restrictions [Member] Maximum [Member] Revolver [Member]	Mar. 31, 2014 IT Related Hardware [Member]	Mar. 31, 2014 IT Related Hardware [Member]	May 31, 2012 IT Related Hardware [Member]	Mar. 31, 2014 IT Related Hardware [Member]	Jan. 31, 2013 IT Related Hardware [Member]	Mar. 31, 2014 IT Related Hardware [Member]	Apr. 30, 2013 IT Related Hardware [Member]	Mar. 31, 2014 Base Rate [Member] Revolver [Member]	Mar. 31, 2014 London Interbank Offered Rate (LIBOR) [Member] Revolver [Member]	Aug. 24, 2012 Revolver [Member] Letter of Credit [Member]	Mar. 31, 2014 Revolver [Member] Overnight Borrowings [Member]	Mar. 31, 2014 Revolver [Member]	Aug. 24, 2012 Revolver [Member]	Mar. 31, 2014 Letter of Credit [Member]	Mar. 31, 2014 Revolver [Member]	Mar. 31, 2014 Minimum [Member] London Interbank Offered Rate (LIBOR) [Member] Revolver [Member]	Mar. 31, 2014 Minimum [Member] Revolver [Member]	Aug. 24, 2012 Minimum [Member] Revolver [Member]	Mar. 31, 2014 Minimum [Member] Capital Lease Obligations [Member]	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member] London Interbank Offered Rate (LIBOR) [Member] Revolver [Member]	Mar. 31, 2014 Maximum [Member] Capital Lease Obligations [Member]	Mar. 31, 2014 Maximum [Member]
Note 11 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity														$ 15,000,000			$ 125,000,000
Line of Credit Facility, Additional Borrowing Capacity																	50,000,000
Line of Credit Facility, Current Borrowing Capacity																						18,800,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		73,500,000
Book Value Of Excess Collateral	137,400,000		31,600,000	20,000,000															30,000,000
Amortization of Borrowing Base																			1,500,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate												1.25%
Debt Instrument, Basis Spread on Variable Rate													2.25%							2.25%					2.75%
Line of Credit Facility, Amount Outstanding															1,600,000			3,800,000
Interest Rate on Overnight Borrowings																4.50%
Line of Credit Facility, Interest Rate at Period End																2.80%
Debt, Weighted Average Interest Rate																3.10%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																0.50%								0.375%			0.50%
Line of Credit Facility, Remaining Borrowing Capacity																38,300,000					18,800,000
Capital Lease Obligations	58,100,000
Effective Interest Rate on Capital Leases																							1.60%			3.10%
Purchase Obligation						121,700	360,000	177,700	295,000	243,900	300,000
Debt Instrument, Periodic Payment						122,000		63,000		5,600
Debt Instrument, Interest Rate, Effective Percentage					3.20%	3.10%		3.10%		4.50%
Contractual Obligation, Due in Next Twelve Months	$ 241,000