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Note 10 - Commitments and Contingencies (Details Textual)
1 Months Ended 12 Months Ended
Jul. 16, 2019
USD ($)
shares
Mar. 16, 2016
USD ($)
shares
Jan. 31, 2016
ft²
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Chief Executive Officer [Member]          
Term of Agreement (Year)   3 years      
Salary and Wage, Officer, Excluding Cost of Good and Service Sold $ 600,000 $ 600,000      
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) | shares 40,000 120,000      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years      
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)       4 years 292 days  
Rental Income, Nonoperating       $ 645,000 $ 622,000
Operating Leases, Future Minimum Payments Receivable, Current       670,000  
Operating Leases, Future Minimum Payments Receivable, in Two Years       689,000  
Operating Leases, Future Minimum Payments Receivable, in Three Years       710,000  
Operating Leases, Future Minimum Payments Receivable, in Four Years       731,000  
Operating Leases, Future Minimum Payments Receivable, in Five Years       $ 566,000