Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Leases (Details Textual)

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Note 7 - Leases (Details Textual)
1 Months Ended 3 Months Ended
Sep. 30, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Feb. 01, 2017
USD ($)
ft²
Operating Leases, Rent Expense, Total   $ 76,000 $ 75,000    
Operating Lease, Weighted Average Remaining Lease Term (Month)   1 year 60 days      
Operating Lease, Weighted Average Discount Rate, Percent       12.50%  
Operating Lease, Property Plant and Equipment, Amount   $ 2,973,000   $ 3,046,000 [1]  
Lessor, Operating Lease, Depreciation on Leased Assets   323,000 $ 311,000    
Assets Leased to Others [Member]          
Operating Lease, Property Plant and Equipment, Amount   1,163,000      
Lessor, Operating Lease, Depreciation on Leased Assets   $ 113,000      
Sublease Agreement for Relocation of Headquarters [Member]          
Area of Real Estate Property (Square Foot) | ft²         12,400
Operating Leases, Monthly Rent Per Rentable Square Foot During First Year         20.5
Operating Leases, Monthly Rent Per Rentable Square Foot During Second Year         21.12
Operating Leases, Monthly Rent Per Rentable Square Foot During Third Year         21.75
Security Deposit         $ 22,000
Operating Leases, Allowance for Certain Improvements         $ 88,000
Noncancelable Operating Lease Agreement for Office Equipment [Member]          
Lessee, Operating Lease, Term of Contract (Month) 3 years        
Operating Leases, Monthly Payment $ 3,000        
[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date.