CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]
BALANCE at Jun. 30, 2017	$ 56,889	$ 212	$ 16,638	$ (11,732)	$ 51,771
BALANCE (in shares) at Jun. 30, 2017		21,174,507		(2,329,850)
Net income	890	$ 0	0	$ 0	890
Stock Options Exercised	12	$ 0	12	$ 0	0
Stock Options Exercised (in shares)		4,185		0
Stock-based compensation expense	33	$ 0	33	$ 0	0
BALANCE at Sep. 30, 2017	57,824	$ 212	16,683	$ (11,732)	52,661
BALANCE (in shares) at Sep. 30, 2017		21,178,692		(2,329,850)
BALANCE at Jun. 30, 2017	56,889	$ 212	16,638	$ (11,732)	51,771
BALANCE (in shares) at Jun. 30, 2017		21,174,507		(2,329,850)
Net income	3,952
BALANCE at Mar. 31, 2018	59,706	$ 212	16,840	$ (13,069)	55,723
BALANCE (in shares) at Mar. 31, 2018		21,191,886		(2,475,245)
BALANCE at Sep. 30, 2017	57,824	$ 212	16,683	$ (11,732)	52,661
BALANCE (in shares) at Sep. 30, 2017		21,178,692		(2,329,850)
Net income	1,233	$ 0	0	$ 0	1,233
Repurchase of Treasury Shares	(194)	$ 0	0	$ (194)	0
Repurchase of Treasury Shares (in shares)		0		(22,600)
Stock Options Exercised	4	$ 0	4	$ 0	0
Stock Options Exercised (in shares)		500		0
Stock-based compensation expense	103	$ 0	103	$ 0	0
BALANCE at Dec. 31, 2017	58,970	$ 212	16,790	$ (11,926)	53,894
BALANCE (in shares) at Dec. 31, 2017		21,179,192		(2,352,450)
Net income	1,829	$ 0	0	$ 0	1,829
Repurchase of Treasury Shares	(1,143)	$ 0	0	$ (1,143)	0
Repurchase of Treasury Shares (in shares)		0		(122,795)
Stock Options Exercised	45	$ 0	45	$ 0	0
Stock Options Exercised (in shares)		12,694		0
Stock-based compensation expense	5	$ 0	5	$ 0	0
BALANCE at Mar. 31, 2018	59,706	$ 212	16,840	$ (13,069)	55,723
BALANCE (in shares) at Mar. 31, 2018		21,191,886		(2,475,245)
BALANCE at Jun. 30, 2018	63,453	$ 212	16,890	$ (13,069)	59,420
BALANCE (in shares) at Jun. 30, 2018		21,204,327		(2,475,245)
Net income	1,504	$ 0	0	$ 0	1,504
Repurchase of Treasury Shares	(549)	$ 0	0	$ (549)	0
Repurchase of Treasury Shares (in shares)		0		(39,163)
Stock Options Exercised	15	$ 0	15	$ 0	0
Stock Options Exercised (in shares)		2,500		0
Stock-based compensation expense	5	$ 0	5	$ 0	0
BALANCE at Sep. 30, 2018	63,709	$ 212	16,910	$ (13,618)	60,205
BALANCE (in shares) at Sep. 30, 2018		21,206,827		(2,514,408)
BALANCE at Jun. 30, 2018	63,453	$ 212	16,890	$ (13,069)	59,420
BALANCE (in shares) at Jun. 30, 2018		21,204,327		(2,475,245)
Net income	7,495
Repurchase of Treasury Shares (in shares)				274,065
BALANCE at Mar. 31, 2019	66,407	$ 212	17,066	$ (17,067)	66,196
BALANCE (in shares) at Mar. 31, 2019		21,224,189		(2,749,310)
Implementation of ASC606 (see Note 2)	(719)	$ 0	0	$ 0	(719)
BALANCE at Sep. 30, 2018	63,709	$ 212	16,910	$ (13,618)	60,205
BALANCE (in shares) at Sep. 30, 2018		21,206,827		(2,514,408)
Net income	2,869	$ 0	0	$ 0	2,869
Repurchase of Treasury Shares	(2,089)	$ 0	0	$ (2,089)	0
Repurchase of Treasury Shares (in shares)		0		(147,230)
Stock Options Exercised	9	$ 0	9	$ 0	0
Stock Options Exercised (in shares)		12,515		0
Stock-based compensation expense	147	$ 0	147	$ 0	0
BALANCE at Dec. 31, 2018	64,645	$ 212	17,066	$ (15,707)	63,074
BALANCE (in shares) at Dec. 31, 2018		21,219,342		(2,661,638)
Net income	3,122	$ 0	0	$ 0	3,122
Repurchase of Treasury Shares	(1,360)	$ 0	0	$ (1,360)	0
Repurchase of Treasury Shares (in shares)		0		(87,672)
Stock Options Exercised	0	$ 0	0	$ 0	0
Stock Options Exercised (in shares)		4,847		0
BALANCE at Mar. 31, 2019	$ 66,407	$ 212	$ 17,066	$ (17,067)	$ 66,196
BALANCE (in shares) at Mar. 31, 2019		21,224,189		(2,749,310)