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Note 8 - Financing Arrangements (Details Textual)
9 Months Ended
Dec. 21, 2017
USD ($)
Dec. 20, 2017
USD ($)
Jun. 28, 2017
May 05, 2017
USD ($)
May 02, 2017
USD ($)
Dec. 20, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 27, 2017
USD ($)
Mar. 31, 2017
USD ($)
[1]
Oct. 31, 2016
USD ($)
Short-term Debt               $ 2,500,000   $ 25,000  
Term Loan A [Member] | Interest Rate Swap [Member]                      
Derivative Liability, Fair Value, Gross Liability               199,000      
Term Loan A [Member] | Interest Rate Swap [Member] | Subsequent Event [Member]                      
Derivative, Notional Amount             $ 10,000,000        
Prior Revolving Credit Facility [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000,000       $ 25,000,000          
Line of Credit Facility, Commitment Fee Percentage           0.15%          
Debt Instrument, Interest Rate, Increase (Decrease)     0.25%                
Prior Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                      
Debt Instrument, Basis Spread on Variable Rate   1.50%                  
Prior Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                      
Debt Instrument, Basis Spread on Variable Rate   2.00%                  
Contrail Loan Agreement's, Revolving Line of Credit [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity       $ 15,000,000              
Minimum Debt Service Coverage Ratio       1.1              
Long-term Line of Credit               9,353,000      
Line of Credit Facility, Remaining Borrowing Capacity               5,647,000      
Guarantor Obligations, Maximum Exposure, Undiscounted       $ 1,600,000              
Minimum Cash Flow Coverage Ratio       2              
Minimum Tangible Net Worth       $ 3,500,000              
Contrail Loan Agreement's, Revolving Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument, Basis Spread on Variable Rate       3.00%              
MBT Credit Agreement [Member]                      
Long-term Debt               19,604,676      
Minimum Debt Service Coverage Ratio 1.25                    
Minimum Asset Coverage Ratio 1.5                    
Debt Issuance Costs, Net               143,813      
Term Loan [Member]                      
Debt Instrument, Basis Spread on Variable Rate         0.25%            
Short-term Debt         $ 2,400,000            
Debt Instrument, Periodic Payment, Principal         $ 200,000            
MBT [Member] | MBT Credit Agreement [Member]                      
Debt Agreement, Maximum Borrowing Capacity $ 26,900,000                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan A [Member]                      
Long-term Debt $ 10,000,000                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan A [Member] | Interest Rate Swap [Member]                      
Derivative, Fixed Interest Rate 4.56%                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan A [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument, Basis Spread on Variable Rate 2.00%                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan B [Member]                      
Long-term Debt $ 5,000,000                    
Debt Instrument, Interest Rate, Stated Percentage 4.50%                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan C [Member]                      
Long-term Debt $ 1,900,000                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan C [Member] | Minimum [Member]                      
Debt Instrument, Interest Rate, Stated Percentage 3.25%                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan C [Member] | Prime Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate (1.00%)                    
MBT [Member] | MBT Credit Agreement [Member] | Term Loan A and B [Member]                      
Debt Instrument, Term 10 years                    
MBT [Member] | MBT Credit Agreement [Member] | Revolving Credit Facility [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000                    
MBT [Member] | MBT Credit Agreement [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate 1.00%                    
BB&T [Member] | Construction Loan Agreement [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity                     $ 1,480,000
Minnesota Bank and Trust [Member] | AirCo [Member]                      
Long-term Debt               3,347,000      
Debt Instrument, Interest Rate, Stated Percentage                 7.25%    
Debt Instrument, Face Amount                 $ 3,441,000    
Debt Issuance Costs, Net               $ 58,000      
[1] Derived from audited consolidated financial statements