Note 9 - Stock Option and Stock Plans - Stock Option Plan Summary (Details) - 2008 Stock Incentive Plan [Member]	12 Months Ended
	Dec. 31, 2016 shares	[1]
Total Shares Authorized (in shares)	600,000
Shares Issued (in shares)	463,420
Shares Remaining (in shares)	136,580

[1] The Board of Directors has approved all stock, stock option and stock warrant issuances.