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Note 8 - Commitments and Contingencies (Details Textual)
3 Months Ended 12 Months Ended
Jul. 29, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Number of Vehicles Leased     15    
Operating Lease, Impairment Loss   $ 125,000 $ 125,000
Operating Leases, Rent Expense, Net, Total       $ 505,000 $ 483,000
Selling and Marketing Expense [Member]          
Operating Lease, Impairment Loss     $ 125,000    
Master Fleet Lease Agreement [Member]          
Number of Vehicles Leased     54    
Lessee, Operating Lease, Term of Contract     3 years    
KBSIII Towers [Member]          
Lessee, Operating Lease, Renewal Term     5 years    
Chief Executive Officer [Member]          
Severance Costs $ 370,000