Note 11 - Stock Based Compensation - Summary of the Status of the Company's Non-vested Restricted Stock Awards (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Non-vested stock awards outstanding at January 1, 2015 (in shares)	81,518	7,018
Non-vested stock awards outstanding at January 1, 2015 (in dollars per share)	$ 2.64	$ 3.32
Granted (in shares)	112,000	88,500
Granted (in dollars per share)	$ 1.63	$ 2.60
Vested and issued (in shares)	(126,518)	(14,000)
Vested and issued (in dollars per share)	$ 1.72	$ 2.72
Non-vested stock awards outstanding at December 31, 2015 (in shares)	67,000	81,518
Non-vested stock awards outstanding at December 31, 2015 (in dollars per share)	$ 2.67	$ 2.64
Vested and issued (in shares)	(126,518)	(14,000)