Note 22 - Segment Information - Segment Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017
Revenues	$ 53,460,000	$ 44,501,000	$ 48,861,000	$ 47,697,000	$ 43,687,000	$ 35,769,000	$ 38,523,000	$ 30,493,000	$ 194,519,345	$ 148,471,659
Operating Income (Loss)	$ 1,005,000	$ 552,000	$ 476,000	$ 2,213,000	$ 1,311,000	$ 1,639,000	$ 1,022,000	$ (7,073,000)	4,245,523	(3,100,773)
Capital Expenditures									20,215,594	2,346,431
Depreciation and Amortization									2,678,858	3,181,845
Corporate, Non-Segment [Member]
Revenues									2,520,521	1,136,311
Operating Income (Loss)									(3,541,853)	(2,787,760)
Capital Expenditures									1,104,089	1,690,109
Depreciation and Amortization									421,243	174,510
Intersegment Eliminations [Member]
Revenues									(11,879,288)	(1,692,859)
Operating Income (Loss)									(1,261,045)	64,801
Capital Expenditures										(3,066,500)
Depreciation and Amortization									(5,298)	(194,610)
Overnight Air Cargo [Member]
Revenues									72,845,353	69,558,334
Overnight Air Cargo [Member] | Operating Segments [Member]
Revenues									72,845,353	69,558,334
Operating Income (Loss)									4,127,322	2,723,933
Capital Expenditures									40,668	95,270
Depreciation and Amortization									110,810	124,793
Ground Equipment Sales [Member]
Revenues									50,004,507	31,447,408
Ground Equipment Sales [Member] | Operating Segments [Member]
Revenues									50,036,035	31,206,009
Operating Income (Loss)									3,840,907	2,378,812
Capital Expenditures									219,592	21,766
Depreciation and Amortization									433,184	597,240
Ground Equipment Sales [Member] | Operating Segments [Member] | Domestic [Member]
Revenues									47,394,193	26,922,009
Ground Equipment Sales [Member] | Operating Segments [Member] | International [Member]
Revenues									2,641,842	4,284,000
Ground Support Services [Member]
Revenues									35,698,171	30,453,246
Ground Support Services [Member] | Operating Segments [Member]
Revenues									35,710,005	30,453,246
Operating Income (Loss)									(179,152)	(500,712)
Capital Expenditures									363,420	465,718
Depreciation and Amortization									471,776	383,963
Printing Equipment and Maintenance [Member]
Revenues									6,144,403	9,019,155
Printing Equipment and Maintenance [Member] | Operating Segments [Member]
Revenues									6,386,882	9,809,997
Operating Income (Loss)									(749,846)	(5,937,522)
Capital Expenditures									181,895	9,927
Depreciation and Amortization									13,135	1,738,819
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | Domestic [Member]
Revenues									3,675,193	5,653,997
Printing Equipment and Maintenance [Member] | Operating Segments [Member] | International [Member]
Revenues									2,711,689	4,156,000
Commercial Jet Engines [Member] | Operating Segments [Member]
Revenues									38,762,521	7,462,902
Operating Income (Loss)									2,003,111	534,762
Capital Expenditures									18,305,930	60,104
Depreciation and Amortization									1,174,764	109,807
Commercial Jet Engines [Member] | Operating Segments [Member] | Domestic [Member]
Revenues									25,324,231	2,688,902
Commercial Jet Engines [Member] | Operating Segments [Member] | International [Member]
Revenues									13,438,290	4,774,000
Leasing [Member]
Revenues									137,316	537,719
Leasing [Member] | Operating Segments [Member]
Revenues									137,316	537,719
Operating Income (Loss)									6,079	422,913
Capital Expenditures										3,070,037
Depreciation and Amortization									$ 59,244	$ 247,323