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Note 6 - Line of Credit and Long-term Debt (Details Textual)
1 Months Ended 9 Months Ended
Aug. 30, 2016
USD ($)
Sep. 18, 2015
USD ($)
Jul. 30, 2015
USD ($)
Aug. 14, 2012
USD ($)
Aug. 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Jul. 31, 2015
USD ($)
Dec. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Aug. 30, 2018
Oct. 06, 2017
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity               $ 2,000,000        
Line of Credit, Current               2,000,000   $ 2,000,000    
Repayments of Notes Payable   $ 500,000                    
Debt Issuance Costs, Net, Total               177,000   200,000    
Long-term Debt, Total               102,000   126,000    
Thermo Fisher Financial [Member]                        
Capital Leased Assets, Gross, Total         $ 52,000              
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               0   7,800    
Bank of the West Finance [Member]                        
Capital Leased Assets, Gross, Total           $ 51,000            
Debt Instrument Periodic Payments Number           60            
Hungtington Technology Finance [Member]                        
Long-term Debt and Capital Lease Obligations, Current and Noncurrent             $ 174,000          
Unsecured Subordinated Loan [Member]                        
Long-term Debt, Gross               1,500,000      
Capital Lease Obligations [Member] | Bank of the West Finance [Member]                        
Debt Instrument, Interest Rate, Stated Percentage           4.18%            
Capital Lease Obligations, Total               14,000   22,000    
Capital Lease Obligations [Member] | Hungtington Technology Finance [Member]                        
Debt Instrument, Interest Rate, Stated Percentage             6.57%          
Long-term Debt and Capital Lease Obligations, Current and Noncurrent               23,000   52,000    
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               1,131,000   $ 1,389,000    
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%                  
Term Loan Agreement, Maturing on August 14, 2032 [Member]                        
Debt Instrument Reference Rate               5.00%   5.50%    
Debt Instrument, Basis Spread on Variable Rate               1.00%        
Proceeds from Issuance of Debt       $ 5,500,000                
Long-term Debt and Capital Lease Obligations, Current and Noncurrent               $ 4,279,000   $ 4,439,000    
Debt Instrument Interest Payment Period       1 year                
Debt Instrument Amortization Period       19 years                
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%        
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                
Term Loan Payable [Member]                        
Term Loan subject to Immediate Repayment Due to Debt Agreement Violation               $ 5,828,000        
Skywords Note [Member] | Unsecured Subordinated Loan [Member]                        
Debt Instrument, Interest Rate, Stated Percentage                 6.50%      
Debt Instrument, Face Amount               1,500,000 $ 1,500,000      
Long-term Debt, Gross               $ 1,500,000        
Equipment Finance Agreement [Member]                        
Debt Instrument, Interest Rate, Stated Percentage                       4.75%
Debt Agreement, Maximum Borrowing Capacity                       $ 175,000
Prime Rate [Member] | The 2015 Loan Agreement [Member]                        
Debt Instrument Reference Rate               5.00%   5.50%    
Debt Instrument, Basis Spread on Variable Rate     2.00%                  
Prime Rate [Member] | Skywords Note [Member] | Unsecured Subordinated Loan [Member]                        
Debt Instrument, Basis Spread on Variable Rate               1.00%        
First Foundation Bank [Member]                        
Long-term Debt and Capital Lease Obligations, Current and Noncurrent               $ 5,410,000        
First Foundation Bank [Member] | Revolving Credit Facility [Member]                        
Line of Credit Facility, Maximum Borrowing Capacity $ 2,000,000                      
Line of Credit, Current               2,000,000   $ 2,000,000    
Debt Covenant, Minimum Current Ratio                   1.5 1.5  
Line of Credit Subject to Immediate Repayment Due to Debt Agreement Violation               $ 2,000,000        
First Foundation Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]                        
Debt Instrument Reference Rate               4.75%   5.50%    
Debt Instrument, Basis Spread on Variable Rate 2.00%