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Note 10 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 29, 2017
Dec. 01, 2017
Jul. 01, 2017
Feb. 24, 2017
Aug. 22, 2016
Aug. 03, 2016
Jul. 26, 2016
Jul. 07, 2016
Jul. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Nov. 13, 2017
May 05, 2017
Stock Issued During Period, Shares, New Issues   898,402       600,000                    
Shares Issued, Price Per Share   $ 3       $ 4.10                    
Proceeds from Issuance of Common Stock   $ 2,700,000                            
Payments of Stock Issuance Costs   327,000       $ 369,000                    
Proceeds from Issuance of Common Stock, Net   $ 2,368,000       $ 2,092,000           $ 2,368,000 $ 2,092,000 $ 2,463,000    
Debt Conversion, Converted Instrument, Shares Issued         6,102,941                      
Allocated Share-based Compensation Expense                       $ 290,000 $ 1,461,000 $ 742,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number                       1,156,027 397,388      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                       795,000        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                       $ 3.02        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value                       $ 8,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period                       5,333 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value                       $ 2.36 $ 2.16 $ 5.75    
General and Administrative Expense [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost                   $ 94,000 $ 539,000          
Chief Executive Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 300,000                              
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 3                              
Chief Operating Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 250,000                              
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 3                              
Employee Stock Option [Member]                                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options                       $ 714,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                       4 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value                       $ 209,000 $ 572,000 $ 354,000    
Employee Stock Option [Member] | Chief Executive Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years                              
Employee Stock Option [Member] | Chief Operating Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       25,000                        
Employee Stock Option [Member] | Former Chief Executive Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number                     72,496          
Employee Stock Option [Member] | Former Chief Financial Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number                   16,248            
Employee Stock Option [Member] | Former Chief Executive Officer and Former Chief Financial Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Pre-Modification of Agreement                       90 days        
Restricted Stock [Member] | Chief Operating Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       25,000                        
Restricted Stock Units (RSUs) [Member]                                
Shares Paid for Tax Withholding for Share Based Compensation                       16,456 145 1,300    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                       10,000 123,417 10,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                       69,278 125,513 6,120    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                       120 days        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options                       $ 2,000        
Restricted Stock Units (RSUs) [Member] | Former Chief Executive Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number                     79,720          
Restricted Stock Units (RSUs) [Member] | Former Chief Financial Officer [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number                   15,914            
Short Term Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period             98,417   118,288              
Shares Paid for Tax Withholding for Share Based Compensation                 46,879              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               104,000                
Share-based Compensation Arrangement by Share-based Payment Award, Aggregate Amount of Issuable Cash Award               $ 276,000                
Share-based Compensation Arrangement by Share-based Payment Award, Amount of Cash Award Issued in Period             $ 266,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     46,781                   51,636      
Amended 2016 Plan [Member                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                             1,325,000 600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                       202,604        
Plan 2012 [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                       25,000        
Common Stock, Capital Shares Reserved for Future Issuance                       2,444        
Plan 2012 [Member] | Employee Stock Option [Member]                                
Options Prices In Terms Of Fair Market Value                       100.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                       10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                       1 year        
2006 Equity Incentive Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number                       81,823        
Equity Incentive Plan 2017 [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,000,000                              
Common Stock, Capital Shares Reserved for Future Issuance 720,000                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 280,000                              
The 2016 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               156,100                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price               $ 2.86                
The 2016 Plan [Member] | Employee Stock Option [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period               7 years                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period               3 years                
Share-based Compensation Arrangement by Share-based Payment Award, Award Ratable Vesting Period               180 days                
Common Stock [Member]                                
Stock Issued During Period, Shares, New Issues                       898,402 600,000 735,294    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period                       5,333        
Convertible Debt [Member] | Boyalife Investment Inc. [Member]                                
Debt Conversion, Original Debt Principal, Amount         $ 12,500,000                      
Debt Conversion, Original Debt Interest, Amount         $ 8,250,000                      
Convertible Debt [Member] | Boyalife Investment Inc. [Member] | Common Stock [Member]                                
Debt Conversion, Converted Instrument, Shares Issued         6,102,941