Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Leases (Details Textual)

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Note 8 - Leases (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2018
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
[1]
Feb. 01, 2017
USD ($)
ft²
Operating Lease, Expense   $ 73,000 $ 75,000 $ 149,000 $ 150,000    
Operating Lease, Weighted Average Remaining Lease Term (Month)   330 days   330 days      
Operating Lease, Weighted Average Discount Rate, Percent   12.50%   12.50%      
Property, Plant and Equipment, Net, Ending Balance   $ 2,853,000   $ 2,853,000   $ 3,046,000  
Depreciation, Depletion and Amortization, Total       651,000 $ 547,000    
Assets Leased to Others [Member]              
Property, Plant and Equipment, Net, Ending Balance   1,087,000   1,087,000      
Depreciation, Depletion and Amortization, Total   $ 115,000   $ 228,000      
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.