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Note 1 - Description of Business and Summary of Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended
May 29, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Aug. 31, 2016
USD ($)
Aug. 30, 2016
USD ($)
Mar. 31, 2015
USD ($)
Number of Microalgal Species Cultivated                   2          
Number of Product Lines                   2          
Number of Operating Segments                   1          
Cash and Cash Equivalents, at Carrying Value, Ending Balance   $ 1,329,000       $ 1,407,000       $ 1,329,000 $ 1,407,000 $ 1,240,000     $ 2,226,000
Working Capital (Deficit)   7,900,000       6,200,000       7,900,000 6,200,000        
Line of Credit, Current   500,000       611,000       500,000 611,000        
Cash Uninsured Amount One   829,000               829,000          
Inventory Valuation Reserves, Ending Balance   5,000       3,000       5,000 3,000        
Inventory Abnormal Production Costs   720,000 $ 4,000 $ 75,000 $ 9,000 5,000 $ 148,000 $ 73,000 $ 28,000 538,000 120,000 395,000      
Non Inventoriable Fixed Costs                   271,000 134,000 149,000      
Asset Retirement Obligation, Ending Balance   0       0       0 0        
Advertising Expense                   1,548,000 813,000 942,000      
Unrecognized Tax Benefits, Ending Balance   0       0       0 0        
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total   0       $ 0       $ 0 $ 0 $ 0      
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                              
Concentration Risk, Percentage                   70.00% 60.00% 58.00%      
Number of Major Customers                   2 1 2      
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Number 1 [Member]                              
Concentration Risk, Percentage                   32.00% 24.00% 19.00%      
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer Number 2 [Member]                              
Concentration Risk, Percentage                   16.00%   11.00%      
Customer Concentration Risk [Member] | Accounts Receivable [Member]                              
Concentration Risk, Percentage                   77.00% 60.00% 44.00%      
Number of Major Customers                   3 3 2      
First Foundation Bank [Member]                              
Long-term Debt and Capital Lease Obligations, Current and Noncurrent   6,400,000               $ 6,400,000          
First Foundation Bank [Member] | Revolving Credit Facility [Member]                              
Line of Credit Facility, Maximum Borrowing Capacity                         $ 2,000,000 $ 2,000,000  
Line of Credit, Current   500,000               500,000       500,000  
Line of Credit Facility, Remaining Borrowing Capacity   $ 1,500,000               $ 1,500,000       $ 1,500,000  
Current Ratio           1.92         1.92        
Debt Covenant, Minimum Current Ratio           2.1         2.1        
First Foundation Bank [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]                              
Line of Credit Facility, Remaining Borrowing Capacity $ 1,000,000                            
Proceeds from Lines of Credit, Total $ 500,000