CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Total
Balance at Jun. 30, 2020	$ 396	$ 17,766	$ (19,521)	$ 77,899	$ 76,540
Balance (in shares) at Jun. 30, 2020	39,588,417		(2,893,715)
Net income				2,319	2,319
Stock-based compensation expense		104			104
Balance at Sep. 30, 2020	$ 396	17,870	$ (19,521)	80,218	78,963
Balance (in shares) at Sep. 30, 2020	39,588,417		(2,893,715)
Balance at Jun. 30, 2020	$ 396	17,766	$ (19,521)	77,899	76,540
Balance (in shares) at Jun. 30, 2020	39,588,417		(2,893,715)
Net income					9,876
Balance at Mar. 31, 2021	$ 396	18,038	$ (19,521)	87,775	86,688
Balance (in shares) at Mar. 31, 2021	39,594,137		(2,893,715)
Balance at Sep. 30, 2020	$ 396	17,870	$ (19,521)	80,218	78,963
Balance (in shares) at Sep. 30, 2020	39,588,417		(2,893,715)
Net income				3,197	3,197
Stock-based compensation expense		84			84
Balance at Dec. 31, 2020	$ 396	17,954	$ (19,521)	83,415	82,244
Balance (in shares) at Dec. 31, 2020	39,588,417		(2,893,715)
Net income				4,360	4,360
Stock-based compensation expense		84			84
Stock options exercised (in shares)	5,720
Balance at Mar. 31, 2021	$ 396	18,038	$ (19,521)	87,775	86,688
Balance (in shares) at Mar. 31, 2021	39,594,137		(2,893,715)
Balance at Jun. 30, 2021	$ 396	18,201	$ (19,521)	93,312	92,388
Balance (in shares) at Jun. 30, 2021	39,595,883		(2,893,715)
Net income				7,752	7,752
Stock-based compensation expense		89			89
Balance at Sep. 30, 2021	$ 396	18,306	$ (19,521)	101,064	100,245
Balance (in shares) at Sep. 30, 2021	39,600,883		(2,893,715)
Balance at Jun. 30, 2021	$ 396	18,201	$ (19,521)	93,312	92,388
Balance (in shares) at Jun. 30, 2021	39,595,883		(2,893,715)
Net income					12,062
Balance at Mar. 31, 2022	$ 396	19,735	$ (19,521)	105,374	105,984
Balance (in shares) at Mar. 31, 2022	39,627,255		(2,893,715)
Balance at Sep. 30, 2021	$ 396	18,306	$ (19,521)	101,064	100,245
Balance (in shares) at Sep. 30, 2021	39,600,883		(2,893,715)
Net income				1,037	1,037
Stock-based compensation expense		1,255			1,255
Balance at Dec. 31, 2021	$ 396	19,700	$ (19,521)	102,101	102,676
Balance (in shares) at Dec. 31, 2021	39,625,471		(2,893,715)
Net income				3,273	3,273
Stock-based compensation expense		35			35
Stock options exercised (in shares)	1,784
Balance at Mar. 31, 2022	$ 396	$ 19,735	$ (19,521)	$ 105,374	$ 105,984
Balance (in shares) at Mar. 31, 2022	39,627,255		(2,893,715)