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Note 10 - Commitments and Contingencies (Details Textual)
1 Months Ended 12 Months Ended
Aug. 30, 2021
$ / shares
shares
Aug. 25, 2021
USD ($)
Aug. 10, 2021
USD ($)
Jul. 31, 2020
USD ($)
shares
Aug. 30, 2021
USD ($)
$ / shares
Jan. 31, 2016
ft²
Mar. 31, 2022
USD ($)
shares
Mar. 31, 2021
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             720,000  
Chief Executive Officer [Member]                
Salary and Wage, Officer, Excluding Cost of Good and Service Sold | $   $ 500,000   $ 626,860        
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)       37,800        
Payments for Stipend | $         $ 10,000      
Lump-sum Severance Payments | $     $ 325,000          
Chief Executive Officer [Member] | The 2016 Employee Equity Compensation Restricted Stock Plan [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 90,000              
Chief Executive Officer [Member] | The 2016 Employee Equity Compensation Restricted Stock Plan [Member] | Performance Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 510,000              
Chief Executive Officer [Member] | The 2016 Employee Equity Compensation Restricted Stock Plan [Member] | Performance Restricted Stock Price Hurdle1 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 85,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 40       $ 40      
Chief Executive Officer [Member] | The 2016 Employee Equity Compensation Restricted Stock Plan [Member] | Performance Restricted Stock Price Hurdle 2 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 107,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 45       45      
Chief Executive Officer [Member] | The 2016 Employee Equity Compensation Restricted Stock Plan [Member] | Performance Restricted Stock Price Hurdle 3 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 106,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 50       50      
Chief Executive Officer [Member] | The 2016 Employee Equity Compensation Restricted Stock Plan [Member] | Performance Restricted Stock Price Hurdle 4 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 106,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 55       55      
Chief Executive Officer [Member] | The 2016 Employee Equity Compensation Restricted Stock Plan [Member] | Performance Restricted Stock Price Hurdle 5 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 106,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 60       $ 60      
Delray Beach Property [Member]                
Percentage of Property Leased to Tenants           48.00%    
Area of Real Estate Property (Square Foot) | ft²           88,000    
Number of Tenants           2 2  
Lessor, Operating Lease, Remaining Weighted Average Lease Term (Year)             3 years  
Rental Income, Nonoperating | $             $ 689,000 $ 670,000
Lessor, Operating Lease, Payment to be Received, Year Two | $             710,000  
Lessor, Operating Lease, Payment to be Received, Year Three | $             731,000  
Lessor, Operating Lease, Payment to be Received, Year Four | $             566,000  
Lessor, Operating Lease, Payment to be Received, Year Five | $             $ 110,000