Stockholders' Equity - Schedule of Share-based Compensation, Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Note 9 - Stockholders' Equity (Details) - Summary of Inactive Plans [Line Items]
Options Outstanding, Beginning Balance	194,612	388,610
Options Outstanding, Granted
Options Outstanding, Exercised
Options Outstanding, Cancelled	(80,135)	(193,998)
Options Outstanding, Ending Balance	114,477	194,612
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 2.59	$ 2.59
Weighted Average Exercise Price, Cancelled	2.69	3.36
Weighted Average Exercise Price, Outstanding Ending Balance	$ 2.52	$ 2.59
2008 Stock Option Plan [Member]
Note 9 - Stockholders' Equity (Details) - Summary of Inactive Plans [Line Items]
Options Outstanding, Beginning Balance	193,945	380,611
Options Outstanding, Granted
Options Outstanding, Exercised
Options Outstanding, Cancelled	(79,468)	(186,666)
Options Outstanding, Ending Balance	114,477	193,945
2005 Stock Option Plan [Member]
Note 9 - Stockholders' Equity (Details) - Summary of Inactive Plans [Line Items]
Options Outstanding, Beginning Balance	667	7,666
Options Outstanding, Granted
Options Outstanding, Exercised
Options Outstanding, Cancelled	(667)	(6,999)
Options Outstanding, Ending Balance		667
Supplemental Stock Option Agreement [Member]
Note 9 - Stockholders' Equity (Details) - Summary of Inactive Plans [Line Items]
Options Outstanding, Beginning Balance		333
Options Outstanding, Granted
Options Outstanding, Exercised
Options Outstanding, Cancelled		(333)
Options Outstanding, Ending Balance