Note 11 - Segment Information - Segment Data (Details) - USD ($)	3 Months Ended	6 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues	$ 48,861,490	$ 38,522,990	$ 96,558,863	$ 69,016,243
Operating Income (Loss)	475,658	1,021,739	2,688,226	(6,051,743)
Capital Expenditures	7,769,220	391,471	8,259,215	911,040
Depreciation and Amortization	529,538	353,672	928,365	2,343,273
Corporate, Non-Segment [Member]
Revenues	290,533	281,926	581,065	563,852
Operating Income (Loss)	(1,385,863)	(531,696)	(2,255,779)	(1,463,533)
Capital Expenditures	542,202	244,703	1,001,855	633,338
Depreciation and Amortization	100,146	36,042	159,493	66,785
Intersegment Eliminations [Member]
Revenues	(292,208)	(302,768)	(583,740)	(3,651,194)
Operating Income (Loss)	49,783	7,199	51,109	(517,790)
Capital Expenditures				(3,066,500)
Depreciation and Amortization	(1,324)	(7,199)	(2,650)	(21,550)
Overnight Air Cargo [Member]
Revenues	18,081,073	17,151,214	34,823,248	33,788,379
Overnight Air Cargo [Member] \| Operating Segments [Member]
Revenues	18,081,073	17,151,214	34,823,248	33,788,379
Operating Income (Loss)	896,506	440,804	1,713,172	1,419,981
Capital Expenditures	20,346	36,040	20,346	36,040
Depreciation and Amortization	30,128	30,100	61,144	59,309
Ground Equipment Sales [Member]
Revenues	15,516,109	11,088,877	21,465,765	15,343,065
Ground Equipment Sales [Member] \| Operating Segments [Member]
Revenues	15,516,109	11,088,877	21,465,765	17,759,565
Operating Income (Loss)	1,165,430	1,243,037	1,331,224	1,585,357
Capital Expenditures	2,258		2,258	19,596
Depreciation and Amortization	117,499	47,326	250,379	94,920
Ground Equipment Sales [Member] \| Operating Segments [Member] \| Domestic [Member]
Revenues	15,046,892	10,305,102	20,323,258	15,691,171
Ground Equipment Sales [Member] \| Operating Segments [Member] \| International [Member]
Revenues	469,217	783,775	1,142,507	2,068,394
Ground Support Services [Member]
Revenues	8,801,326	7,038,151	17,914,399	13,838,193
Ground Support Services [Member] \| Operating Segments [Member]
Revenues	8,801,326	7,038,151	17,914,399	13,838,193
Operating Income (Loss)	276,113	(240,717)	632,937	(350,769)
Capital Expenditures	117,919	110,728	143,284	212,139
Depreciation and Amortization	113,625	87,273	225,256	170,709
Printing Equipment and Maintenance [Member]
Revenues	1,302,922	1,727,896	4,434,303	4,287,984
Printing Equipment and Maintenance [Member] \| Operating Segments [Member]
Revenues	1,302,922	1,748,738	4,434,303	4,958,826
Operating Income (Loss)	(482,222)	(11,851)	441,814	(6,947,210)
Capital Expenditures	8,491		8,491	9,927
Depreciation and Amortization	3,316	45,803	8,007	1,726,404
Printing Equipment and Maintenance [Member] \| Operating Segments [Member] \| Domestic [Member]
Revenues	280,328	1,016,697	1,724,310	3,249,403
Printing Equipment and Maintenance [Member] \| Operating Segments [Member] \| International [Member]
Revenues	1,022,594	732,041	2,709,993	1,709,423
Commercial Jet Engines [Member] \| Operating Segments [Member]
Revenues	5,126,919	1,295,107	17,853,260	1,295,107
Operating Income (Loss)	(48,760)	42,806	762,180	42,806
Capital Expenditures	7,078,004		7,082,981
Depreciation and Amortization	151,338	28,406	197,114	28,406
Commercial Jet Engines [Member] \| Operating Segments [Member] \| Domestic [Member]
Revenues	2,275,190	450,188	10,466,075	450,188
Commercial Jet Engines [Member] \| Operating Segments [Member] \| International [Member]
Revenues	2,851,729	844,919	7,387,185	844,919
Leasing [Member]
Revenues	34,816	221,745	70,563	463,515
Leasing [Member] \| Operating Segments [Member]
Revenues	34,816	221,745	70,563	463,515
Operating Income (Loss)	4,671	72,157	11,569	179,415
Capital Expenditures				3,066,500
Depreciation and Amortization	$ 14,810	$ 85,921	$ 29,622	$ 218,290

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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