Note 8 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Payroll expenses and taxes payable	$ 127,000	$ 269,000
Commissions and bonuses payable and general accrued liabilities	505,000	1,073,000
	$ 632,000	$ 1,342,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.