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Note 9 - Debt (Details Textual)
1 Months Ended 3 Months Ended 7 Months Ended 15 Months Ended
Jul. 28, 2016
USD ($)
Jul. 28, 2016
CAD ($)
Jun. 19, 2012
USD ($)
Oct. 31, 2018
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2019
CAD ($)
Apr. 30, 2019
USD ($)
Jan. 31, 2019
USD ($)
Sep. 20, 2018
USD ($)
Sep. 19, 2018
USD ($)
Debt and Lease Obligation, Total         $ 13,300,000   $ 13,300,000   $ 13,300,000      
Debt Instrument, Increase (Decrease), Net, Total         3,000,000              
Repayments of Lines of Credit         24,622,000 $ 6,571,000            
Line of Credit, Current         5,642,000   5,642,000   5,642,000 $ 8,890,000    
Canadian Mortgage Note [Member]                        
Proceeds from Issuance of Debt $ 6,100,000 $ 8,000,000                    
Debt Instrument, Maturity Date Dec. 23, 2042 Dec. 23, 2042                    
Debt Instrument, Interest Rate, Effective Percentage 6.05% 6.05%                    
Debt Instrument, Periodic Payment, Interest $ 28,000 $ 37,000                    
Debt Instrument, Periodic Payment, Principal $ 20,000 $ 27,000                    
Mortgage Note Secured by Tennessee Manufacturing Facility [Member]                        
Debt Instrument, Interest Rate, Stated Percentage     4.50%                  
Debt Instrument, Maturity Date     Jul. 01, 2027                  
Debt Instrument, Issuance Date     Jun. 19, 2012                  
Proceeds from Issuance of Secured Debt     $ 1,800,000                  
Debt Instrument, Periodic Payment, Total     $ 13,000                  
Debt Instrument, Adjustable Interest Rate Period, Commencement Date     Jun. 19, 2022                  
Debt Instrument, Interest Rate, Maximum Annual Increase     2.00%                  
Debt Instrument, Adjustable Interest Rate, Ceiling     18.00%                  
Debt Instrument, Adjustable Interest Rate, Floor     4.50%                  
Revolving Lines, North America [Member]                        
Debt Instrument, Term       3 years                
Line of Credit Facility, Maximum Borrowing Capacity                     $ 18,000,000 $ 15,000,000
Repayments of Lines of Credit             $ 3,773,823 $ 4,794,528        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage             0.375% 0.375%        
Line of Credit Facility, Capital Expenditures Restrictions         $ 3,000,000   $ 3,000,000   $ 3,000,000      
Line of Credit Facility, Covenant Terms, EBITDA Ratio, Term One         1.1   1.1   1.1      
Line of Credit Facility, Covenant Terms, EBITDA Ratio, Term Two                   1.1    
Debt Instrument, Interest Rate, Stated Percentage                     2.00%  
Line of Credit, Current         $ 5,600,000   $ 5,600,000   $ 5,600,000      
Debt, Weighted Average Interest Rate         6.72%   6.72%   6.72%      
Line of Credit Facility, Current Borrowing Capacity         $ 2,800,000   $ 2,800,000   $ 2,800,000      
Revolving Lines, North America [Member] | Maximum [Member]                        
Line of Credit Facility, Interest Rate at Period End         8.50%   8.50%   8.50%      
Revolving Lines, North America [Member] | Minimum [Member]                        
Line of Credit Facility, Interest Rate at Period End         6.49%   6.49%   6.49%      
Revolving Lines, North America [Member] | Senior Credit Facility, Interest Rate 8.5 Percent [Member]                        
Line of Credit, Current         $ 600,000   $ 600,000   $ 600,000      
Revolving Lines, North America [Member] | Senior Credit Facility, Interest Rate 6.49 Percent [Member]                        
Line of Credit, Current         5,000,000   5,000,000   5,000,000      
Letter of Credit [Member]                        
Repayments of Lines of Credit             154,500          
Foreign Revolving Lines [Member]                        
Line of Credit Facility, Maximum Borrowing Capacity         9,000,000   9,000,000   9,000,000      
Line of Credit, Current         $ 500,000   $ 500,000   $ 500,000      
Debt, Weighted Average Interest Rate         6.30%   6.30%   6.30%      
Letters of Credit Outstanding, Amount         $ 5,900,000   $ 5,900,000   $ 5,900,000      
Line of Credit Facility, Remaining Borrowing Capacity         $ 2,600,000   $ 2,600,000   $ 2,600,000      
Foreign Revolving Lines [Member] | EIBOR [Member]                        
Debt Instrument, Basis Spread on Variable Rate                 3.50%      
Foreign Revolving Lines [Member] | Maximum [Member]                        
Line of Credit Facility, Interest Rate at Period End         6.30%   6.30%   6.30%      
Foreign Revolving Lines [Member] | Minimum [Member]                        
Debt Instrument, Interest Rate, Stated Percentage         4.50%   4.50%   4.50%      
Line of Credit Facility, Interest Rate at Period End         6.15%   6.15%   6.15%