Note 16 - Stock Based Compensation - Valuation Assumptions (Details)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividend yield(1)	[1]	0.00%	0.00%	0.00%
Assumed forfeiture rate(5)	[2]	6.00%	10.00%	19.00%
Minimum [Member]
Expected volatility(2)	[3]	44.00%	46.38%	53.78%
Risk-free interest rate(3)	[4]	1.89%	1.23%	1.49%
Expected life (in years) (4) (Year)	[5]	5 years 182 days	5 years 182 days	5 years 182 days
Maximum [Member]
Expected volatility(2)	[3]	50.09%	52.54%	56.00%
Risk-free interest rate(3)	[4]	2.30%	1.82%	2.00%
Expected life (in years) (4) (Year)	[5]	7 years	7 years	7 years

[1] A dividend yield of 0.0% is utilized because cash dividends have never been paid.

[2] Forfeiture rate is determined through forfeited and expired options as a percentage of options granted over the current three year period.

[3] Expected volatility is based on Bloomberg's five and one-half to seven year volatility calculation for "FRBK" stock.

[4] The risk-free interest rate is based on the five to seven year Treasury bond.

[5] The expected life reflects a 1 to 4 year vesting period, the maximum ten year term and review of historical behavior.