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Note 6 - Long-term Debt (Details Textual)
1 Months Ended 2 Months Ended 12 Months Ended
Oct. 06, 2017
USD ($)
Sep. 18, 2015
USD ($)
Jul. 01, 2015
Mar. 31, 2015
USD ($)
Aug. 14, 2012
USD ($)
Feb. 29, 2016
USD ($)
Jul. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Aug. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Repayments of Notes Payable   $ 500,000             $ 600,000 $ 500,000    
Long-term Debt, Total                 156,000        
Proceeds from Issuance of Long-term Debt, Total                 166,000 $ 2,407,000    
Capital Leased Assets, Gross, Total                 373,000 373,000      
Thermo Fisher Financial [Member]                          
Capital Leased Assets, Gross, Total                       $ 52,000  
Thermo Fisher Financial [Member] | Capital Lease Obligations [Member]                          
Debt Instrument, Interest Rate, Stated Percentage       6.50%                  
Long-term Debt and Capital Lease Obligations, Current and Noncurrent       $ 86,000         $ 0 30,000      
Debt Instrument Periodic Payments Number       36                  
Thermo Fisher Financial [Member] | Capital Lease Asses Payable in 36 Equal Monthly Payments [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                 12.90%        
Debt Instrument Periodic Payments Number                 36        
Capital Lease Obligations, Total                 $ 28,000 43,000      
Bank of the West Finance [Member]                          
Capital Leased Assets, Gross, Total           $ 51,000              
Debt Instrument Periodic Payments Number           60              
Bank of the West Finance [Member] | Capital Lease Obligations [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                 4.18%        
Capital Lease Obligations, Total                 $ 32,000 42,000      
Hungtington Technology Finance [Member]                          
Long-term Debt and Capital Lease Obligations, Current and Noncurrent                         $ 174,000
Hungtington Technology Finance [Member] | Capital Lease Obligations [Member]                          
Debt Instrument, Interest Rate, Stated Percentage     6.57%                    
Long-term Debt and Capital Lease Obligations, Current and Noncurrent                 $ 88,000 121,000      
Debt Instrument Periodic Payments Number     60                    
The 2015 Loan Agreement [Member]                          
Proceeds from Issuance of Debt             $ 2,500,000            
Debt Instrument, Term             7 years            
Debt Instrument, Prepayment Penalty Percentage                 5.00%        
Debt Instrument, Prepayment Penalty Percentage Reduction During Each Year                 1.00%        
Long-term Debt and Capital Lease Obligations, Current and Noncurrent                 $ 1,726,000 2,049,000      
Debt Instrument One Time Origination and Guaranty Fees                 $ 113,900        
Debt Instrument Annual Renewal Fee Payable Percentage                 0.50%        
Debt Instrument Guaranteed Portion                 80.00%        
The 2015 Loan Agreement [Member] | Minimum [Member]                          
Debt Instrument, Interest Rate, Stated Percentage                 6.00%        
The 2015 Loan Agreement [Member] | Prime Rate [Member]                          
Debt Instrument Reference Rate                 4.75%        
Debt Instrument, Basis Spread on Variable Rate                 2.00%        
Term Loan Agreement, Maturing on August 14, 2032 [Member]                          
Proceeds from Issuance of Debt         $ 5,500,000                
Debt Instrument Reference Rate                 4.75%        
Debt Instrument, Basis Spread on Variable Rate                 1.00%        
Long-term Debt and Capital Lease Obligations, Current and Noncurrent                 $ 4,648,000 $ 4,854,000      
Debt Instrument One Time Origination and Guaranty Fees                 $ 214,500        
Debt Instrument Annual Renewal Fee Payable Percentage                   0.25%      
Debt Instrument Guaranteed Portion                   80.00%      
Debt Instrument Interest Payment Period         1 year                
Debt Instrument Amortization Period         19 years                
Term Loan Agreement, Maturing on August 14, 2032 [Member] | Minimum [Member]                          
Debt Instrument, Interest Rate During Period                 5.50%        
Term Loan Agreement, Promissory Note One [Member]                          
Proceeds from Issuance of Debt         $ 2,250,000                
Term Loan Agreement, Promissory Note Two [Member]                          
Proceeds from Issuance of Debt         $ 3,250,000                
Equipment Finance Agreement [Member]                          
Debt Instrument, Term 5 years                        
Debt Instrument, Interest Rate, Stated Percentage 4.75%                        
Debt Agreement, Maximum Borrowing Capacity $ 175,000                        
Equipment Finance Agreement [Member] | Restricted Cash [Member]                          
Proceeds from Issuance of Long-term Debt, Total               $ 65,000