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Note 2 - Summary of Significant Accounting Policies (Details Textual)
9 Months Ended 12 Months Ended
Aug. 10, 2017
Sep. 17, 2015
USD ($)
Sep. 30, 2014
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Jan. 01, 2019
USD ($)
Feb. 23, 2018
USD ($)
Allowance for Doubtful Accounts Receivable, Current, Ending Balance       $ 139,000 $ 60,000    
Provision for Doubtful Accounts       43,000 37,000    
Inventory Write-down       0 0    
Deferred Rent Credit       64,000 96,000    
Amortization, Total       33,000 39,000    
Asset Impairment Charges, Total       $ 130,000 $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding, Number | shares       2,574,665 6,457,335    
Net Income (Loss) Attributable to Parent, Total       $ (5,865,000) $ (6,893,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Warrants, Outstanding, Aggregate Intrinsic Value       $ 93,000      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       0 0    
Payments of Dividends, Total       $ 0      
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member]              
Operating Lease, Right-of-Use Asset           $ 2,200,000  
Operating Lease, Liability, Total           $ 2,200,000  
Earliest Tax Year [Member] | Domestic Tax Authority [Member]              
Open Tax Year       2014      
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]              
Open Tax Year       2014      
Latest Tax Year [Member] | Domestic Tax Authority [Member]              
Open Tax Year       2018      
Latest Tax Year [Member] | State and Local Jurisdiction [Member]              
Open Tax Year       2018      
Interest Rate Swap [Member] | Cash Flow Hedging [Member]              
Derivative, Notional Amount             $ 10,000,000
Derivative, Fixed Interest Rate             2.52%
Interest Rate Swap [Member] | Fair Value Hedging [Member]              
Derivative, Notional Amount   $ 10,000,000          
Derivative, Swaption Interest Rate   1.88%          
The 2017 Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member]              
Unamortized Debt Issuance Expense       $ 208,000      
Line of Credit Facility, Expiration Period       3 years      
The 2017 Credit Agreement [Member] | East West Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate 3.50%            
Minimum [Member]              
Property, Plant and Equipment, Useful Life       5 years      
Minimum [Member] | The 2014 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate   4.50% 4.50%        
Minimum [Member] | The 2014 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Domestic Rate Loans [Member]              
Debt Instrument, Basis Spread on Variable Rate   4.50%          
Maximum [Member]              
Property, Plant and Equipment, Useful Life       30 years      
Maximum [Member] | The 2014 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate   5.50% 5.50%        
Maximum [Member] | The 2014 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Domestic Rate Loans [Member]              
Debt Instrument, Basis Spread on Variable Rate   5.50%          
Accounts Receivable [Member] | Customer Concentration Risk [Member]              
Number of Major Customers       0 1    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]              
Concentration Risk, Percentage         12.00%    
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]              
Number of Major Customers       1 1    
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer A [Member]              
Concentration Risk, Percentage       10.00% 9.00%    
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer B [Member]              
Concentration Risk, Percentage         15.00%