Note 8 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Payroll expenses and tax payable	$ 229,000	$ 232,000
Commission and bonuses payable and general accrued liabilities	1,505,000	1,333,000
	$ 1,734,000	$ 1,565,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2017 has been prepared using information from the audited consolidated balance sheet as of that date.