Note 8 - Segment Data (Details) - USD ($)	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Overnight Air Cargo [Member]
Operating Revenues:
Overnight Air Cargo	$ 12,889,190	$ 11,680,942
Operating Income (Loss):
Overnight Air Cargo	236,435	545,287
Capital Expenditures:
Overnight Air Cargo	24,325	38,580
Depreciation and Amortization:
Overnight Air Cargo	34,472	38,173
Ground Equipment Sales [Member] | Domestic [Member]
Operating Revenues:
Overnight Air Cargo	1,978,029	4,473,939
Ground Equipment Sales [Member] | International [Member]
Operating Revenues:
Overnight Air Cargo	2,061,208	837,994
Ground Equipment Sales [Member]
Operating Revenues:
Overnight Air Cargo	4,039,237	5,311,933
Operating Income (Loss):
Overnight Air Cargo	(424,045)	(180,198)
Capital Expenditures:
Overnight Air Cargo	125,770	151,731
Depreciation and Amortization:
Overnight Air Cargo	95,440	126,173
Ground Support Services [Member]
Operating Revenues:
Overnight Air Cargo	5,430,093	4,785,662
Operating Income (Loss):
Overnight Air Cargo	(222,095)	221,414
Capital Expenditures:
Overnight Air Cargo	69,401	84,705
Depreciation and Amortization:
Overnight Air Cargo	41,232	43,828
Corporate Segment [Member]
Operating Income (Loss):
Overnight Air Cargo	$ (639,394)	$ (487,679)
Capital Expenditures:
Overnight Air Cargo
Depreciation and Amortization:
Overnight Air Cargo	$ 7,473	$ 8,366
Overnight Air Cargo	22,358,520	21,778,537
Overnight Air Cargo	(1,049,099)	98,824
Overnight Air Cargo	219,496	275,016
Overnight Air Cargo	$ 178,617	$ 216,540