Note 14 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Granted (in shares)	154,500
Granted (in dollars per share)	$ 6.19	$ 4.34	$ 3.17
Forfeited (in shares)	(28,302)
Service Based Options [Member]
Balance at beginning of period, nonvested (in shares)	413,228
Weighted average grant date fair value, beginning of period, nonvested (in dollars per share)	$ 3.79
Nonvested Contractual Life (Year)	5 years 73 days	5 years 36 days
Granted (in shares)	154,500
Granted (in dollars per share)	$ 6.19
Granted (Year)	6 years 255 days
Vested (in shares)	(146,546)
Vested (in dollars per share)	$ 3.73
Vested (Year)	3 years 146 days
Forfeited (in shares)	(27,702)
Forfeited (in dollars per share)	$ 4.26
Forfeited (Year)	5 years 36 days
Balance at end of period, nonvested (in shares)	393,480	413,228
Weighted average grant date fair value, end of period, nonvested (in dollars per share)	$ 4.72	$ 3.79