Note 9 - Financing Arrangements (Details Textual)		9 Months Ended	33 Months Ended
	Jul. 18, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016	Aug. 09, 2016 USD ($)	Mar. 31, 2016 USD ($)	Apr. 01, 2015 USD ($)
Stock Repurchased and Retired During Period, Value		$ 7,917,009
Secured Long-term Debt, Noncurrent								$ 7,000,000
Construction Loan Agreement [Member] | BB&T [Member]
Long-term Line of Credit		$ 77,000	$ 77,000
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,480,000
Revolving Credit Facility [Member]
Minimum Fixed Charge Coverage Ratio		1.35	1.35
Maximum Leverage Ratio		3.5	3.5
Maximum Amount of Assets the Company and It's Subsidiaries Lease or Hold for Leasing Required by the Financial Covenants for the Credit Agreement		$ 5,000,000	$ 5,000,000
Long-term Line of Credit		$ 18,300,000	$ 18,300,000				$ 0
Line of Credit Facility, Commitment Fee Percentage			0.15%
Line of Credit Facility, Maximum Borrowing Capacity						$ 25,000,000		$ 20,000,000
Revolving Credit Facility [Member] | Delphax [Member]
Debt Instrument, Interest Rate, Effective Percentage		10.50%	10.50%
Long-term Line of Credit		$ 1,200,000	$ 1,200,000				$ 1,800,000
Line of Credit Facility, Maximum Borrowing Capacity		7,000,000	7,000,000
Revolving Credit Facility [Member] | Contrail Aviation Support LLC. [Member]
Long-term Line of Credit		0	0
Line of Credit Facility, Maximum Borrowing Capacity		2,200,000	2,200,000
Revolving Credit Facility [Member] | BMO Harris Bank N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Eligible Inventory	75.00%
Stock Repurchased and Retired During Period, Value	$ 9,000,000
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Outstanding Eligible Accounts Receivable	80.00%
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 1,600,000
Minimum Debt Service Coverage Ratio	1.75
Maximum Ratio of Total Liabilities to Tangible Net Worth	2.5
Annual Operating Lease Payments Limitation	$ 10,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 12,000,000
Revolving Credit Facility [Member] | Period of April 01, 2016 to March 31, 2017 [Member]
Minimum Consolidated Tangible Net Worth		$ 18,000,000	$ 18,000,000
Percentage of Consolidated Net Income		50.00%	50.00%
Revolving Credit Facility [Member] | Period of April 01, 2016 to June 30, 2016 [Member]
Minimum Asset Coverage Ratio		1.25	1.25
Revolving Credit Facility [Member] | Period of October 01, 2016 to December 31, 2016 [Member]
Minimum Asset Coverage Ratio		1.5	1.5
Revolving Credit Facility [Member] | After March 31, 2017 [Member]
Minimum Asset Coverage Ratio		1.75	1.75
Revolving Credit Facility [Member] | Period of July 01, 2016 to September 30, 2016 [Member]
Minimum Asset Coverage Ratio					1.25
Revolving Credit Facility [Member] | Period of January 01, 2017 to March 31, 2017 [Member]
Minimum Asset Coverage Ratio					1.5
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative, Basis Spread on Variable Rate		1.50%	1.50%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | BMO Harris Bank N.A. [Member]
Debt Instrument, Basis Spread on Variable Rate	2.80%
Revolving Credit Facility [Member] | Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500,000	$ 500,000