Note 16 - Segment Information - Segment Data (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues	$ 49,340,777	$ 48,861,490	$ 110,208,246	$ 96,558,863
Operating Income (Loss)	(1,620,001)	475,658	983,701	2,688,226
Capital Expenditures	19,513,634	7,769,220	19,973,209	8,259,215
Depreciation and Amortization	1,826,905	529,538	3,322,306	928,365
Corporate, Non-Segment [Member]
Revenues	189,297	325,349	364,689	651,628
Operating Income (Loss)	(1,934,819)	(1,381,192)	(3,665,694)	(2,244,210)
Capital Expenditures	34,010	542,202	111,240	1,001,855
Depreciation and Amortization	150,416	114,956	295,711	189,115
Intersegment Eliminations [Member]
Revenues	(15,412)	(292,208)	(17,746)	(583,740)
Operating Income (Loss)	198	49,783	198	51,109
Depreciation and Amortization	(1,324)	(1,324)	(2,649)	(2,650)
Overnight Air Cargo [Member]
Revenues	17,064,600	18,081,073	34,705,258	34,823,248
Overnight Air Cargo [Member] | Operating Segments [Member]
Revenues	17,064,600	18,081,073	34,705,258	34,823,248
Operating Income (Loss)	197,870	896,506	1,254,562	1,713,172
Capital Expenditures	28,460	20,346	34,456	20,346
Depreciation and Amortization	21,178	30,128	43,941	61,144
Ground Equipment Sales [Member]
Revenues	12,838,796	15,516,109	19,223,577	21,465,765
Ground Equipment Sales [Member] | Operating Segments [Member]
Revenues	12,845,520	15,516,109	19,232,634	21,465,765
Operating Income (Loss)	697,557	1,165,430	1,091,057	1,331,224
Capital Expenditures	156,230	2,258	296,320	2,258
Depreciation and Amortization	65,384	117,499	156,733	250,379
Ground Equipment Sales [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	11,069,537	15,046,892	16,361,554	20,323,258
Ground Equipment Sales [Member] | Operating Segments [Member] | International [Member]
Revenues	1,775,983	469,217	2,871,080	1,142,507
Ground Support Services [Member]
Revenues	8,474,037	8,801,326	17,521,677	17,914,399
Ground Support Services [Member] | Operating Segments [Member]
Revenues	8,474,037	8,801,326	17,521,677	17,914,399
Operating Income (Loss)	(742,482)	276,113	(830,206)	632,937
Capital Expenditures	8,062	117,919	60,500	143,284
Depreciation and Amortization	119,816	113,625	244,871	225,256
Printing Equipment and Maintenance [Member]
Revenues	139,945	1,302,922	438,768	4,434,303
Printing Equipment and Maintenance [Member] | Operating Segments [Member]
Revenues	139,945	1,302,922	438,768	4,434,303
Operating Income (Loss)	(413,298)	(482,222)	(654,368)	441,814
Capital Expenditures		8,491		8,491
Depreciation and Amortization	15,307	3,316	29,638	8,007
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	2,824	280,328	193,726	1,724,310
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | International [Member]
Revenues	137,121	1,022,594	245,042	2,709,993
Commercial Jet Engines [Member] | Operating Segments [Member]
Revenues	10,642,791	5,126,919	37,962,966	17,853,260
Operating Income (Loss)	574,974	(48,760)	3,788,153	762,180
Capital Expenditures	19,286,871	7,078,004	19,470,692	7,082,981
Depreciation and Amortization	1,456,129	151,338	2,554,062	197,114
Commercial Jet Engines [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	5,341,234	2,275,190	27,659,269	10,466,075
Commercial Jet Engines [Member] | Operating Segments [Member] | International [Member]
Revenues	$ 5,301,557	$ 2,851,729	$ 10,303,697	$ 7,387,185