Note 11 - Segment Information - Segment Data (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 44,501,246	$ 35,769,170	$ 141,060,109	$ 104,785,413
Operating Income (Loss)	551,680	1,639,417	3,239,906	(4,412,326)
Capital Expenditures	6,988,029	606,967	15,247,244	1,518,007
Depreciation and Amortization	815,590	411,798	1,743,955	2,755,071
Corporate, Non-Segment [Member]
Revenues	338,490	281,926	919,555	845,778
Operating Income (Loss)	(83,335)	(453,577)	(2,339,114)	(1,917,110)
Capital Expenditures	44,462		1,046,317	3,066,500
Depreciation and Amortization	130,109	49,390	289,602	116,175
Intersegment Eliminations [Member]
Revenues	(4,590,777)	2,339,973	(5,174,517)	(1,311,221)
Operating Income (Loss)	(376,849)	556,268	(325,740)	38,478
Capital Expenditures				(3,066,500)
Depreciation and Amortization	(1,324)	(171,734)	(3,974)	(193,284)
Overnight Air Cargo [Member]
Revenues	18,028,688	17,099,640	52,851,936	50,888,019
Overnight Air Cargo [Member] | Operating Segments [Member]
Revenues	18,028,688	17,099,640	52,851,936	50,888,019
Operating Income (Loss)	996,819	716,356	2,709,991	2,136,337
Capital Expenditures	7,076	43,542	27,422	79,582
Depreciation and Amortization	27,161	31,866	88,305	91,175
Ground Equipment Sales [Member]
Revenues	12,911,101	5,400,258	34,376,866	20,743,323
Ground Equipment Sales [Member] | Operating Segments [Member]
Revenues	12,922,907	2,742,360	34,388,672	20,501,925
Operating Income (Loss)	1,084,303	(912,893)	2,415,527	672,464
Capital Expenditures	206,603		208,861	19,596
Depreciation and Amortization	90,558	359,021	340,937	453,941
Ground Equipment Sales [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	11,877,589	781,519	32,200,847	16,472,690
Ground Equipment Sales [Member] | Operating Segments [Member] | International [Member]
Revenues	1,045,318	1,960,841	2,187,825	4,029,235
Ground Support Services [Member]
Revenues	8,643,267	7,579,661	26,557,666	21,417,854
Ground Support Services [Member] | Operating Segments [Member]
Revenues	8,651,138	7,579,661	26,565,537	21,417,854
Operating Income (Loss)	(114,064)	(41,199)	518,873	(391,968)
Capital Expenditures	70,241	119,381	213,525	331,520
Depreciation and Amortization	121,340	103,600	346,596	274,309
Printing Equipment and Maintenance [Member]
Revenues	905,860	2,653,899	5,340,163	6,941,883
Printing Equipment and Maintenance [Member] | Operating Segments [Member]
Revenues	1,048,793	2,689,898	5,483,096	7,648,724
Operating Income (Loss)	(984,465)	1,056,972	(542,651)	(5,890,238)
Capital Expenditures	19,926		28,417	9,927
Depreciation and Amortization	2,570	(13,082)	10,577	1,713,322
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	1,048,793	2,151,030	2,773,103	5,400,433
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | International [Member]
Revenues		538,868	2,709,993	2,248,291
Commercial Jet Engines [Member] | Operating Segments [Member]
Revenues	8,068,145	2,998,165	25,921,405	4,293,272
Operating Income (Loss)	38,047	491,479	800,227	534,285
Capital Expenditures	6,639,721	50,154	13,722,702	50,154
Depreciation and Amortization	430,366	38,221	627,480	66,627
Commercial Jet Engines [Member] | Operating Segments [Member] | Domestic [Member]
Revenues	6,718,293	1,558,983	17,184,368	2,009,171
Commercial Jet Engines [Member] | Operating Segments [Member] | International [Member]
Revenues	1,349,852	1,439,182	8,737,037	2,284,101
Leasing [Member]
Revenues	33,863	37,547	104,426	501,062
Leasing [Member] | Operating Segments [Member]
Revenues	33,863	37,547	104,426	501,062
Operating Income (Loss)	(8,776)	226,011	2,793	405,426
Capital Expenditures		393,890		1,027,228
Depreciation and Amortization	$ 14,810	$ 14,516	$ 44,432	$ 232,806