Note 11 - Segment Data (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Overnight Air Cargo [Member]
Operating Revenues:
Revenues	$ 18,674,458	$ 12,973,810	$ 48,949,401	$ 36,626,144
Operating Income (Loss):
Operating Income (Loss)	1,413,667	602,776	3,394,326	1,425,692
Capital Expenditures:
Capital Expenditures	6,618	152,606	82,607	240,945
Depreciation and Amortization:
Depreciation and Amortization	37,068	39,371	106,161	118,411
Ground Equipment Sales [Member] | Domestic [Member]
Operating Revenues:
Revenues	19,024,052	9,142,043	41,165,115	23,775,339
Ground Equipment Sales [Member] | International [Member]
Operating Revenues:
Revenues	1,320,235	3,497,312	4,501,549	12,127,129
Ground Equipment Sales [Member]
Operating Revenues:
Revenues	20,344,287	12,639,354	45,666,664	35,902,468
Operating Income (Loss):
Operating Income (Loss)	3,874,921	1,704,445	8,013,932	4,448,349
Capital Expenditures:
Capital Expenditures	119,455	8,299	338,194	1,357,847
Depreciation and Amortization:
Depreciation and Amortization	165,401	135,585	364,465	393,767
Ground Support Services [Member]
Operating Revenues:
Revenues	6,559,110	5,279,822	17,974,239	14,767,637
Operating Income (Loss):
Operating Income (Loss)	25,829	262,099	(392,002)	574,212
Capital Expenditures:
Capital Expenditures	220,816	60,367	429,588	175,703
Depreciation and Amortization:
Depreciation and Amortization	60,993	$ 40,645	149,560	$ 126,540
Printing Equipment and Maintenance [Member] | Domestic [Member]
Operating Revenues:
Revenues	789,000		789,000
Printing Equipment and Maintenance [Member] | International [Member]
Operating Revenues:
Revenues	246,000		246,000
Printing Equipment and Maintenance [Member]
Operating Revenues:
Revenues	1,035,000		1,035,000
Operating Income (Loss):
Operating Income (Loss)	$ (883,000)		$ (883,000)
Capital Expenditures:
Capital Expenditures
Depreciation and Amortization:
Depreciation and Amortization	$ 17,000		$ 17,000
Leasing [Member]
Operating Revenues:
Revenues	5,718		5,718
Operating Income (Loss):
Operating Income (Loss)	1,378		1,378
Depreciation and Amortization:
Depreciation and Amortization	2,195		2,195
Corporate Segment [Member]
Operating Income (Loss):
Operating Income (Loss)	(542,678)	$ (428,500)	(1,788,966)	$ (1,611,987)
Capital Expenditures:
Capital Expenditures	190,733		200,666
Depreciation and Amortization:
Depreciation and Amortization	13,817	$ 6,054	28,214	$ 22,107
Revenues	46,618,573	30,892,986	113,631,022	87,296,249
Operating Income (Loss)	3,890,117	2,140,820	8,345,668	4,836,266
Capital Expenditures	537,622	221,272	1,051,055	1,774,495
Depreciation and Amortization	$ 296,474	$ 221,654	$ 667,595	$ 660,825