Note 10 - Warrants (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Year Ended					Year Ended
	December 31, 2019					December 31, 2018
				Wtd. Avg.					Wtd. Avg.
				Exercise					Exercise
	Shares			Price		Shares			Price
Outstanding at beginning of year		4,080,005		$	4.35		6,688,849		$	4.50
Exercised		(121,000	)		4.75		(2,608,844	)		4.75
Outstanding and exercisable at end of year		3,959,005		$	4.33		4,080,005		$	4.35