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Note 12 - Stock-based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 15 Months Ended
Mar. 27, 2023
Jun. 15, 2022
USD ($)
$ / shares
shares
Jul. 10, 2020
shares
Jun. 01, 2020
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Sep. 30, 2018
shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
$ / shares
shares
Sep. 01, 2025
shares
Aug. 11, 2020
shares
Aug. 31, 2018
shares
Oct. 30, 2014
shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)             6 years 8 months 12 days              
Share-Based Payment Arrangement, Expensed and Capitalized, Amount | $             $ 30   $ 45          
Reverse Stock Split [Member]                            
Stockholders' Equity Note, Stock Split, Conversion Ratio 3   3   3 30 3              
Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares         $ 7.59   $ 7.59     $ 7.59        
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)     6,000,000     600,000           2,000,000 18,000,000 7,390,355
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)                     1,532,242      
Amended and Restated 2006 Non-employee Director Stock Option Plan [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)         233,334   233,334     233,334        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)         3,890   3,890     3,890        
Chief Executive Officer [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       160,000                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares (in shares)   106,667                        
Chief Financial Officer [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       80,000                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares (in shares)   53,334                        
Share-Based Payment Arrangement, Option [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Revenue Target | $   $ 38,000                        
Share-Based Compensation Arrangement by Share-Based Payment Award, EBITDA target | $   $ 3,600                        
Share-Based Payment Arrangement, Option [Member] | General and Administrative Expense [Member] | Share-Based Payment Arrangement, Employee [Member]                            
Share-Based Payment Arrangement, Expense | $             $ 225 $ 646            
Share-Based Payment Arrangement, Option [Member] | General and Administrative Expense [Member] | Share-Based Payment Arrangement, Nonemployee [Member]                            
Share-Based Payment Arrangement, Expense | $             43     $ 82        
Share-Based Payment Arrangement, Option [Member] | Stock Incentive Plan 2014 [Member] | Share-Based Payment Arrangement, Tranche One [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage       33.33%                    
Share-Based Payment Arrangement, Option [Member] | Stock Incentive Plan 2014 [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage       33.33%                    
Share-Based Payment Arrangement, Option [Member] | Stock Incentive Plan 2014 [Member] | Share-Based Payment Arrangement, Tranche Three [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage       33.33%                    
Share-Based Payment Arrangement, Option [Member] | Chief Executive Officer [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)       10 years                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years                    
Share-Based Payment Arrangement, Option [Member] | Chief Financial Officer [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)       10 years                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years                    
New Options [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Payment Arrangement, Guaranteed Price (in dollars per share) | $ / shares   $ 19.20                        
Share-Based Payment Arrangement, Expense | $             $ 3              
New Options [Member] | Stock Incentive Plan 2014 [Member] | Minimum [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares             $ 0.63              
New Options [Member] | Stock Incentive Plan 2014 [Member] | Maximum [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares             $ 1.11              
New Options [Member] | Chief Executive Officer [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)   10 years                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares (in shares)   333,334                        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares   $ 3.00                        
New Options [Member] | Chief Financial Officer [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares (in shares)   200,000                        
New Options [Member] | Non-executives [Member] | Stock Incentive Plan 2014 [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)             100,000              
Time Vesting Awards [Member] | Share-Based Payment Arrangement, Employee [Member]                            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $         $ 148   $ 148     148        
Time Vesting Awards [Member] | Share-Based Payment Arrangement, Nonemployee [Member]                            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $         107   107     107        
Performance Vesting Awards [Member] | Share-Based Payment Arrangement, Employee [Member]                            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $         $ 471   $ 471     $ 471