Activity - Stock Option, Restricted Stock and Restricted Stock Units (Details) - $ / shares	3 Months Ended	6 Months Ended		12 Months Ended
	Oct. 31, 2017	Apr. 30, 2018	Apr. 30, 2017	Oct. 31, 2016
Employee Stock Option [Member]
Number of Shares
Options, Outstanding Beginning of Period		58,166	89,666
Granted		0
Exercised		(11,000)	(8,000)
Canceled		0	(23,500)
Options, Outstanding End of Period	58,166	47,166	58,166	89,666
Weighted-Average Exercise Price
Options, Outstanding, Beginning of Period, Weighted Average Exercise Price Per Share		$ 8.16	$ 9.67
Granted, Weighted Average Exercise Price Per Share		0.00
Exercised, Weighted Average Exercise Price Per Share		2.98	9.79
Forfeitures and Expirations in Period, Weighted Average Exercise Price		0.00	13.38
Options, Outstanding, End of Period, Weighted Average Exercise Price Per Share	$ 8.16	$ 9.37	$ 8.16	$ 9.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	2 years 6 months 10 days	2 years 3 months 24 days	3 years 1 month 18 days	3 years 16 days
Restricted Stock [Member]
Weighted-Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 7 months 5 days
Weighted Average Grant Date Fair Value Restricted Stock and RSUs
Nonvested, Beginning of Period		441,282	376,340
Stock, Granted		267,526	245,932
Stock, Vested		(183,124)	(157,512)
Stock, Forfeited		(7,510)	(3,443)
Nonvested, End of Period	441,282	518,174	461,317	376,340
Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period		$ 7.07	$ 6.40
Granted, Weighted Average Grant Date Fair Value		8.06	7.93
Vested, Weighted Average Grant Date Fair Value		7.69	5.71
Forfeited, Weighted Average Grant Date Fair Value		7.89	10.10
Nonvested, Weighted Average Grant Date Fair Value, End of Period	$ 7.07	$ 7.35	$ 7.19	$ 6.40
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms		1 year 11 months 22 days	1 year 10 months	1 year 10 months
Restricted Stock Units (RSUs) [Member]
Weighted Average Grant Date Fair Value Restricted Stock and RSUs
Nonvested, Beginning of Period		35,815	21,539
Stock, Granted		17,618	29,253
Stock, Vested		(15,341)	(13,574)
Stock, Forfeited		(10,500)	0
Nonvested, End of Period	35,815	27,592	37,218	21,539
Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period		$ 7.69	$ 4.17
Granted, Weighted Average Grant Date Fair Value		7.90	8.62
Vested, Weighted Average Grant Date Fair Value		8.30	4.17
Forfeited, Weighted Average Grant Date Fair Value		5.96	0.00
Nonvested, Weighted Average Grant Date Fair Value, End of Period	$ 7.69	$ 8.14	$ 7.53	$ 4.17
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	1 year 9 months 25 days	1 year 11 months 4 days	2 years 3 months 20 days	1 year 9 months 12 days