Note 8 - Segment Data (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Overnight Air Cargo [Member]
Operating Revenues:
Revenues	$ 17,385,753	$ 11,971,392	$ 30,274,943	$ 23,652,334
Operating Income (Loss):
Operating Income (Loss)	1,744,224	277,629	1,980,659	822,916
Capital Expenditures:
Capital Expenditures	51,664	49,759	75,989	88,339
Depreciation and Amortization:
Depreciation and Amortization	34,621	40,868	69,093	79,041
Ground Equipment Sales [Member] | Domestic [Member]
Operating Revenues:
Revenues	20,163,034	10,159,358	22,141,063	14,633,297
Ground Equipment Sales [Member] | International [Member]
Operating Revenues:
Revenues	1,120,106	7,791,823	3,181,314	8,629,817
Ground Equipment Sales [Member]
Operating Revenues:
Revenues	21,283,140	17,951,181	25,322,377	23,263,114
Operating Income (Loss):
Operating Income (Loss)	4,563,056	2,924,102	4,139,011	2,743,904
Capital Expenditures:
Capital Expenditures	92,969	1,197,817	218,739	1,349,548
Depreciation and Amortization:
Depreciation and Amortization	103,624	132,009	199,064	258,182
Ground Support Services [Member]
Operating Revenues:
Revenues	5,985,036	4,702,153	11,415,129	9,487,815
Operating Income (Loss):
Operating Income (Loss)	(195,736)	90,699	(417,831)	312,113
Capital Expenditures:
Capital Expenditures	139,371	30,631	208,772	115,336
Depreciation and Amortization:
Depreciation and Amortization	47,335	42,068	88,567	85,896
Corporate Segment [Member]
Operating Income (Loss):
Operating Income (Loss)	(606,894)	$ (695,808)	(1,246,288)	$ (1,183,487)
Capital Expenditures:
Capital Expenditures	9,933		9,933
Depreciation and Amortization:
Depreciation and Amortization	6,924	$ 7,687	14,397	$ 16,053
Revenues	44,653,929	34,624,726	67,012,449	56,403,263
Operating Income (Loss)	5,504,651	2,596,622	4,455,551	2,695,446
Capital Expenditures	293,937	1,278,207	513,433	1,553,223
Depreciation and Amortization	$ 192,504	$ 222,631	$ 371,121	$ 439,171