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Note 10 - Financing Arrangements (Details Textual) - USD ($)
 12 Months Ended
Jan. 06, 2017
Jul. 18, 2016
Mar. 31, 2017
Jul. 26, 2017
May 02, 2017
Jan. 05, 2017
Oct. 31, 2016
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months     $ 25,000        
Long-term Debt, Maturities, Repayments of Principal in Year Two     17,968,000        
Long-term Debt, Maturities, Repayments of Principal in Year Three     60,000        
Long-term Debt, Maturities, Repayments of Principal after Year Five     295,000        
Delphax [Member]              
Line of Credit Facility, Maximum Borrowing Capacity $ 2,500,000         $ 7,000,000  
Repayments of Long-term Lines of Credit $ 1,260,000            
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Purchase Orders from Customers 100.00%            
Line of Credit Facility, Maximum Borrowing Capacity, Maximum Value of Purchase Orders Included in Borrowing Base $ 500,000            
Line of Credit Facility, Interest Rate at Period End 2.50%            
Upon Execution of the Amendment [Member] | Delphax [Member]              
Line of Credit Facility, Commitment Fee Amount $ 25,000            
Upon Repayment in Full of All Loans Under the Senior Credit Agreement [Member] | Delphax [Member]              
Line of Credit Facility, Commitment Fee Amount $ 50,000            
Construction Loan Agreement [Member] | BB&T [Member]              
Line of Credit Facility, Maximum Borrowing Capacity             $ 1,480,000
Long-term Line of Credit     562,000        
Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 25,000,000        
Line of Credit Facility, Commitment Fee Percentage     0.15%        
Minimum Consolidated Tangible Net Worth     $ 18,000,000        
Minimum Fixed Charge Coverage Ratio     1.35        
Maximum Leverage Ratio     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        
Long-term Line of Credit     $ 17,908,000        
LIBOR Rate     0.98%        
Revolving Credit Facility [Member] | Subsequent Event [Member]              
Line of Credit Facility, Maximum Borrowing Capacity         $ 25,000,000    
Revolving Credit Facility [Member] | Delphax [Member] | Subsequent Event [Member]              
Nontrade Receivables       $ 1,510,000      
Revolving Credit Facility [Member] | Delphax [Member]              
Long-term Line of Credit     $ 1,873,000        
Revolving Credit Facility [Member] | BMO Harris Bank N.A. [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     3,200,000        
Line of Credit Facility, Maximum Borrowing Capacity, Percentage of Eligible Inventory   75.00%          
Line of Credit Facility, Maximum Borrowing Capacity, Maximum Value of Eligible Inventory Included in Borrowing Base   $ 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          
Revolving Credit Facility [Member] | Contrail Aviation Support LLC. [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 12,000,000          
Long-term Line of Credit     $ 0        
Revolving Credit Facility [Member] | Period of April 01, 2016 to March 31, 2017 [Member]              
Percentage of Consolidated Net Income     50.00%        
Revolving Credit Facility [Member] | Period of October 01, 2016 to December 31, 2016 [Member]              
Minimum Asset Coverage Ratio     1.5        
Revolving Credit Facility [Member] | After March 31, 2017 [Member]              
Minimum Asset Coverage Ratio     1.75        
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate     2.00%        
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] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Derivative, Basis Spread on Variable Rate     1.50%        
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]              
Derivative, Basis Spread on Variable Rate     2.00%        
Revolving Credit Facility [Member] | Letter of Credit [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 500,000