Note 8 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Payroll expenses and taxes payable	$ 448,000	$ 299,000
Commissions and bonuses payable and general accrued liabilities	1,270,000	621,000
Accrued liabilities	$ 1,718,000	$ 920,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2019 has been prepared using information from the audited consolidated balance sheet as of that date.