Note 4 - PNC Credit Facility (Details Textual)							1 Months Ended		3 Months Ended				6 Months Ended	9 Months Ended				34 Months Ended
	Sep. 17, 2016	Aug. 10, 2016 USD ($)	Mar. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 17, 2015 USD ($)	Mar. 29, 2015	Mar. 28, 2015	Sep. 30, 2014 USD ($)	Nov. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2016	Sep. 30, 2015 USD ($)	Jun. 30, 2016	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2019 USD ($)	Mar. 28, 2016 USD ($)	Feb. 27, 2015 USD ($)
Two Thousand Fourteen Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit, Minimum Monthly Availability		$ 658,000	$ 1,500,000
Two Thousand Fourteen Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit, Minimum Monthly Availability		$ 3,500,000	8,000,000
Two Thousand Fourteen Credit Agreement [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member]
Line of Credit, Minimum Monthly Availability									$ 500,000									$ 1,000,000
Two Thousand Fourteen Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument, Term								5 years
Line of Credit Facility, Maximum Borrowing Capacity			$ 30,000,000					$ 30,000,000									$ 30,000,000		$ 40,000,000
Line of Credit Facility Limitation on Borrowings Percentage of Eligible Receivables								85.00%									85.00%
Line of Credit Facility Limitation on Borrowings Percentage of Appraised Value of Trucks and Equipment		80.00%						85.00%									85.00%
Line of Credit Facility Limitation on Borrowings Percentage of Appraised Value of Trucks and Equipment, Monthly Reduction		0.50%
Payments of Debt Issuance Costs		$ 200,000
Long-term Debt										$ 25,318,584				$ 25,318,584
Unamortized Debt Issuance Expense										469,054				469,054
Two Thousand Fourteen Credit Agreement [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate					4.50%												2.50%
Two Thousand Fourteen Credit Agreement [Member] | Minimum [Member] | Base Rate [Member] | Domestic Rate Loans [Member]
Debt Instrument, Basis Spread on Variable Rate	4.50%																1.00%
Two Thousand Fourteen Credit Agreement [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate					5.50%												3.50%
Two Thousand Fourteen Credit Agreement [Member] | Maximum [Member] | Base Rate [Member] | Domestic Rate Loans [Member]
Debt Instrument, Basis Spread on Variable Rate	5.50%																2.00%
Two Thousand Fourteen Credit Agreement [Member] | Base Rate [Member] | Domestic Rate Loans [Member]
Debt Instrument, Interest Rate, Increase (Decrease)			1.75%
Two Thousand Fourteen Credit Agreement [Member] | Domestic Rate Loans [Member]
Long-term Debt										$ 68,584				$ 68,584
Debt Instrument, Interest Rate, Effective Percentage										6.50%				6.50%
Line of Credit Facility, Remaining Borrowing Capacity										$ 1,300,000				$ 1,300,000
Two Thousand Fourteen Credit Agreement [Member] | LIBOR Based Loans [Member]
Long-term Debt										$ 25,250,000				$ 25,250,000
Debt Instrument, Interest Rate, Effective Percentage										5.00%				5.00%
Two Thousand Fourteen Credit Agreement [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																	0.375%
Leverage Ratio				4.25		3.5	2.75				4.5		3.5
Debt Instrument, Interest Rate, Increase (Decrease)				0.25%
Maximum Capital Expenditures															$ 7,800,000
Two Thousand Twelve Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 16,000,000									$ 16,000,000
Guaranteed Loan [Member]
Principal Prepayment Eliminate Monthly Fee																				$ 100,000
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Unrealized Gain (Loss) on Derivatives										$ 65,000				$ (107,000)
Fair Value Hedging [Member] | Interest Rate Swap [Member]
Derivative, Notional Amount					$ 10,000,000
Derivative, Swaption Interest Rate					1.88%
Payments of Debt Issuance Costs												$ 100,000		50,000		$ 100,000
Long-term Debt				$ 904,768						797,188				797,188
Unamortized Debt Issuance Expense				$ 532,870						$ 469,054				$ 469,054