Note 14 - Segment Information - Segment Data (Details) - USD ($)	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 60,867,469	$ 47,697,373
Operating Income (Loss)	2,603,702	2,212,568
Capital Expenditures	459,575	489,995
Depreciation and Amortization	1,495,401	398,827
Corporate, Non-Segment [Member]
Revenues	474,205	326,279
Operating Income (Loss)	(1,729,200)	(863,018)
Capital Expenditures	77,230	459,653
Depreciation and Amortization	145,295	74,159
Intersegment Eliminations [Member]
Revenues	(1,141,536)	(291,532)
Operating Income (Loss)	5,803	1,326
Capital Expenditures	(1,325)	(1,326)
Overnight Air Cargo [Member]
Revenues	17,640,658	16,742,175
Overnight Air Cargo [Member] | Operating Segments [Member]
Revenues	17,640,658	16,742,175
Operating Income (Loss)	1,056,692	816,666
Capital Expenditures	5,996
Depreciation and Amortization	22,763	31,016
Ground Equipment Sales [Member]
Revenues	6,384,781	5,949,656
Ground Equipment Sales [Member] | Operating Segments [Member]
Revenues	6,387,114	5,949,656
Operating Income (Loss)	393,500	165,794
Capital Expenditures	140,090
Depreciation and Amortization	91,349	132,880
Ground Equipment Sales [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	5,292,017	5,276,366
Ground Equipment Sales [Member] | Operating Segments [Member] | International [Member]
Revenues	1,095,097	673,290
Ground Support Services [Member]
Revenues	9,047,640	9,113,073
Ground Support Services [Member] | Operating Segments [Member]
Revenues	9,047,640	9,113,073
Operating Income (Loss)	(87,724)	356,824
Capital Expenditures	52,438	25,365
Depreciation and Amortization	125,055	111,631
Printing Equipment and Maintenance [Member]
Revenues	298,823	3,131,381
Printing Equipment and Maintenance [Member] | Operating Segments [Member]
Revenues	302,713	3,131,381
Operating Income (Loss)	(318,278)	924,036
Capital Expenditures
Depreciation and Amortization	14,331	4,691
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	194,792	1,443,982
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | International [Member]
Revenues	107,921	1,687,399
Commercial Jet Engines [Member] | Operating Segments [Member]
Revenues	28,156,675	12,726,341
Operating Income (Loss)	3,282,908	810,940
Capital Expenditures	183,821	4,977
Depreciation and Amortization	1,097,933	45,776
Commercial Jet Engines [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	23,154,535	8,190,885
Commercial Jet Engines [Member] | Operating Segments [Member] | International [Member]
Revenues	$ 5,002,140	$ 4,535,456