Note 8 - Long-term Debt (Details) (USD $)					12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended		12 Months Ended			12 Months Ended						12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014 Scenario, Forecast [Member] Maximum [Member] Revolver [Member]	Dec. 31, 2013 Scenario, Actual [Member] Revolver [Member]	Dec. 31, 2013 Collateral Suppression [Member] Revolver [Member]	Dec. 31, 2013 Collateral Suppression [Member] Revolver [Member]	Dec. 31, 2013 Additional Restrictions [Member] Maximum [Member] Revolver [Member]	Dec. 31, 2013 IT Related Hardware [Member]	Dec. 31, 2013 IT Related Hardware [Member]	May 31, 2012 IT Related Hardware [Member]	Dec. 31, 2013 IT Related Hardware [Member]	Jan. 31, 2013 IT Related Hardware [Member]	Dec. 31, 2013 IT Related Hardware [Member]	Apr. 30, 2013 IT Related Hardware [Member]	Dec. 31, 2013 Base Rate [Member] Revolver [Member]	Dec. 31, 2013 London Interbank Offered Rate (LIBOR) [Member] Revolver [Member]	Aug. 24, 2012 Revolver [Member] Letter of Credit [Member]	Dec. 31, 2013 Revolver [Member]	Aug. 24, 2012 Revolver [Member]	Dec. 31, 2013 Letter of Credit [Member]	Dec. 31, 2013 Revolver [Member]	Dec. 31, 2013 Minimum [Member] London Interbank Offered Rate (LIBOR) [Member] Revolver [Member]	Dec. 31, 2013 Minimum [Member] Revolver [Member]	Aug. 24, 2012 Minimum [Member] Revolver [Member]	Dec. 31, 2013 Minimum [Member] Capital Lease Obligations [Member]	Dec. 31, 2013 Minimum [Member] Revolver [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member] London Interbank Offered Rate (LIBOR) [Member] Revolver [Member]	Dec. 31, 2013 Maximum [Member] Revolver [Member]	Dec. 31, 2013 Maximum [Member] Capital Lease Obligations [Member]	Dec. 31, 2013 Maximum [Member]
Note 8 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity																$ 15,000,000		$ 125,000,000		$ 33,400,000
Line of Credit Facility, Additional Borrowing Capacity																		50,000,000
Line of Credit Facility, Current Borrowing Capacity																							18,750,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases		73,500,000																										71,000,000
Book Value Of Excess Collateral	136,600,000		24,000,000			20,000,000														30,000,000					20,000,000
Amortization of Borrowing Base																				1,500,000
Reduced Borrowing Availability					6,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate														1.25%
Debt Instrument, Basis Spread on Variable Rate															2.25%						2.25%						2.75%
Interest Rate on Overnight Borrowings																	4.50%
Line of Credit Facility, Interest Rate at Period End																	2.40%
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, Amount Outstanding																			2,800,000
Line of Credit Facility, Remaining Borrowing Capacity				33,400,000													39,400,000					18,750,000
Capital Lease Obligations	63,600,000
Effective Interest Rate on Capital Leases																								1.60%					4.40%
Purchase Obligation								120,800	360,000	176,400	295,000	257,800	300,000
Debt Instrument, Periodic Payment								122,000		63,000		5,600
Debt Instrument, Interest Rate, Effective Percentage							3.16%	3.05%		3.05%		4.492%
Contractual Obligation, Due in Next Twelve Months	$ 234,000