Note 13 - Segement Information - Segment Data (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Overnight Air Cargo [Member] | Operating Segments [Member]
Operating Revenues:
Revenues	$ 17,151,214	$ 17,385,753	$ 33,788,379	$ 30,274,943
Operating Income (Loss):
Operating Income (Loss)	440,804	1,479,205	1,419,981	1,384,762
Capital Expenditures:
Capital Expenditures	36,040	51,664	36,040	75,989
Depreciation and Amortization	30,100	34,621	59,309	69,093
Overnight Air Cargo [Member]
Operating Revenues:
Revenues	17,151,214	17,385,753	33,788,379	30,274,943
Ground Equipment Sales [Member] | Operating Segments [Member] | Domestic [Member]
Operating Revenues:
Revenues	10,305,102	20,163,034	15,691,171	22,141,063
Ground Equipment Sales [Member] | Operating Segments [Member] | International [Member]
Operating Revenues:
Revenues	783,775	1,120,106	2,068,394	3,181,314
Ground Equipment Sales [Member] | Operating Segments [Member]
Operating Revenues:
Revenues	11,088,877	21,283,140	17,759,565	25,322,377
Operating Income (Loss):
Operating Income (Loss)	1,243,037	4,363,084	1,585,357	3,843,913
Capital Expenditures:
Capital Expenditures		92,969	19,596	218,739
Depreciation and Amortization	47,326	103,624	94,920	199,064
Ground Equipment Sales [Member]
Operating Revenues:
Revenues	11,088,877	21,283,140	15,343,065	25,322,377
Ground Support Services [Member] | Operating Segments [Member]
Operating Revenues:
Revenues	7,038,151	5,985,036	13,838,193	11,415,129
Operating Income (Loss):
Operating Income (Loss)	(240,717)	(270,737)	(350,769)	(606,193)
Capital Expenditures:
Capital Expenditures	110,728	139,371	212,139	208,772
Depreciation and Amortization	87,273	47,335	170,709	88,567
Ground Support Services [Member]
Operating Revenues:
Revenues	7,038,151	5,985,036	13,838,193	11,415,129
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | Domestic [Member]
Operating Revenues:
Revenues	1,016,697		3,249,403
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | International [Member]
Operating Revenues:
Revenues	732,041		1,709,423
Printing Equipment and Maintenance [Member] | Operating Segments [Member]
Operating Revenues:
Revenues	1,748,738	0	4,958,826
Operating Income (Loss):
Operating Income (Loss)	(11,851)		(6,947,210)
Capital Expenditures:
Capital Expenditures			9,927
Depreciation and Amortization	45,803		1,726,404
Printing Equipment and Maintenance [Member]
Operating Revenues:
Revenues	1,727,896	0	4,287,984
Commercial Jet Engines [Member] | Operating Segments [Member] | Domestic [Member]
Operating Revenues:
Revenues	450,188		450,188
Commercial Jet Engines [Member] | Operating Segments [Member] | International [Member]
Operating Revenues:
Revenues	844,919		844,919
Commercial Jet Engines [Member] | Operating Segments [Member]
Operating Revenues:
Revenues	1,295,107		1,295,107
Operating Income (Loss):
Operating Income (Loss)	42,806		42,806
Capital Expenditures:
Capital Expenditures
Depreciation and Amortization	28,406		28,406
Commercial Jet Engines [Member]
Operating Revenues:
Revenues	1,295,107		1,295,107
Leasing [Member] | Operating Segments [Member]
Operating Revenues:
Revenues	221,745		463,515
Operating Income (Loss):
Operating Income (Loss)	72,157		179,415
Capital Expenditures:
Capital Expenditures			3,066,500
Depreciation and Amortization	85,921		218,290
Leasing [Member]
Operating Revenues:
Revenues	221,745		463,515
Corporate, Non-Segment [Member]
Operating Revenues:
Revenues	281,926	265,838	563,852	531,047
Operating Income (Loss):
Operating Income (Loss)	(531,696)	(66,901)	(1,463,533)	(166,931)
Capital Expenditures:
Capital Expenditures	244,703	9,933	633,338	9,933
Depreciation and Amortization	36,042	6,924	66,785	14,397
Intersegment Eliminations [Member]
Operating Revenues:
Revenues	(302,768)	(265,838)	(3,651,194)	(531,047)
Operating Income (Loss):
Operating Income (Loss)	7,199		(517,790)
Capital Expenditures:
Capital Expenditures			(3,066,500)
Depreciation and Amortization	(7,199)		(21,550)
Revenues	38,522,990	44,653,929	69,016,243	67,012,449
Operating Income (Loss)	1,021,739	5,504,651	(6,051,743)	4,455,551
Capital Expenditures	391,471	293,937	911,040	513,433
Depreciation and Amortization	$ 353,672	$ 192,504	$ 2,343,273	$ 371,121