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Note 7 - Intangible Assets and Goodwill (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Nov. 24, 2015
Amortization of Intangible Assets, Total		$ 323,000	$ 105,000
Goodwill, Ending Balance		$ 4,417,605	4,417,605
Contrail Aviation Support, Inc. [Member]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		38.00%
Delphax [Member]
Goodwill, Ending Balance	$ 0				$ 375,000
Goodwill, Impairment Loss	$ 275,000			$ 100,000
Contrail Aviation Support, Inc. [Member]
Goodwill, Ending Balance		$ 4,200,000
Trade Names and Patents [Member]
Impairment of Intangible Assets, Finite-lived			$ 1,110,000